Jack

* See also Andrew Ryan
* See also Twist
* See also BS1
* See also Atlas/Fontaine/Suchong/Tenenbaum
* See also Perceptions_Altered
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Under the orders of Fontaine, Jack was created by Dr Suchong (and Tenenbaum) from an acquired embryo which contained Ryan's and Jasmine Jolene's DNA. The embryo was subjected to a process of accelerated physical and mental growth and training for two years. At that point, a fully adult-formed Jack was sent to The Surface to await being brought back to Rapture (two years later) to be used to assassinate Ryan. 
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Think of Jack being 'George' from "Of Mice and Men", who knows little of the realities of the World beyond what a 4-year-old knows (if even that). What REALLY would such a person be capable of understanding about Rapture, OR where he goes once he no longer has that voice leading him around ? 
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CLUE : 'When me and the kraut put you in that sub you were no older than two' :
Radio Message Fontaine at end of Proving Grounds
"I remember when me and the Kraut put you in that sub. You were no more than two. You were my ace in the hole, but you were also the closest thing I ever had to a son. And that's why this hurts. Betrayal, kid. Life ain't strictly business."
(If it is true) Jack is a total of 4-years-old = Only 2 years of development/conditioning work ?? 
Timeline Clues : 
* It references some date when Tenenbaum was still working for Fontaine (pre-Fontaine-death)
* Development of a 'Jack' would itself take time ( need time allowances made for the R&D and with many potential failures )
1960 - 4 = 1956 (minimum) ( So this whole plan was started rather early ...) 
NOTE also "Ace in the Hole" is mentioned, which was used in (term created for) Burial At Sea.
How much of this is also just BS from Fontaine the Sociopath ? "Son", "Betrayal" ... He still has no real problem doing such.
NOTE - "The Kraut" is Tenenbaum ( evidence SHE was involved with Jack's development/Project )
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Even if quite limited (notice Jack really cant speak but can fire a gun really well), growing a mind in 2 years far outstrips doing mere accelerate body growth.
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JackSmokes.jpg
JackOnPlane.jpg
The Big Lie (BS1 Plot) :
Just about everything Atlas/Fontaine told you in the game was a lie/sham/con. Most of your understanding of the game's story is shaped by his weasel words. He says Ryan is at fault, when just about everything he claims (and you see) is Fontaine's own doing.
You might eventually realize that YOU (Jack) are something programmed by Fontaine to follow everything he says ( so much for "moral choice" - in the game you are allowed no alternate path ). Perhaps everything you see is warped by that programming. Jack is a 4-year-old mutant with only as much 'Understanding' as could be stuffed into his head in that time - With conclusions pre-arranged and tailored to the mission Fontaine wants.
Think about this : Jack is the only survivor of that Planecrash. He is a Mass Murderer apparently unaware ( from your eyes it is of course hidden ) of the people he killed as the game just starts. How many did he kill in cold blood even before the plane crash to do the hijacking to seize control and then crashing the plane ?
Funny thing is : What life does Jack have when he leaves in the 'Good' Ending -- As he is really an empty vessel. Is he damaged by what he has gone through, or an already irrepairable 4-year old mutant ? It may be quite fortunate if he dies of accelerated old age ( AND who says the 'saved' Little Sisters, implied to be around him on his deathbed, are actually not themselves terribly warped/damaged creatures as well ? ) Is Jack put in an insane asylum, if he continues his murderous ways ( all that he was programmed for ) after he leaves Rapture ?
Realizing these things kinda changes the story - Don't it ? Too bad the game writers missed all this potential and went for the simpleton endings/plotlines.
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Jack the Wonder Pawn :
It all depends if you say it is Fantasy. You should be trying to make the Story relatable to what the Player might know of the Real World.
Consider Jack doing Celestial Navigation and Flying a modern passenger airplane, and most exceptionally crashing the plane into the ocean without killing himself. He has Hitamn skills to mass murder the passengers and crew.
These are All things you don't just simply inject into (condition) someone for. Things such as these dont just take time to learn/develope, but can require a skill and often a 'vocation' to do successfully.
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Jack's Guided Tour Might NOT Have Been Typical Rapture (Even Splicer Plagued Rapture) :
Consider that the parts of Rapture Jack went through being such a mess because he was guided through the disrupted/insecure areas by Atlas/Fontaine to get him through to Ryan intact. That may ALSO imply that the Security in the rest of Rapture WASN'T as much as you saw along that path. ( Ryan wouldn't want trigger-happy Automatics in places normal citizens still inhabited ). All that Security in the better 'Safe' parts could be maintained with well-armed Militia/Guards. 
After Ryan's apparent death, his Faction (centered in Hephaestus) continued to try to contain the anarchy and terrorism (as per my MMORPG storyline). Later they did alot to isolate Sofia Lamb (who was centered in Persephone) from killing the rest of Rapture (We went through ANOTHER worse than normal path in BS2).
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You Took Too Much .. Too Much :Line from the Movie "Fear and Loathing In Las Vegas : https://www.imdb.com/title/tt0120669/ "
If you played Jack by taking as much (or half) the ADAM/Plasmids he had available, then by the end of  BioShock 1 you are probably the 'Posterboy' for ADAM Disease (Tumors, Deformities and Insanity).  The so called 'good' ending really would have Jack being eaten alive by the effects of so much ADAM ... ( Would he have lived long enough for the Little Sisters he rescued to have grown up ? )
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Jack is a Mass Murderer (From the Start) :
So Near the End of BaS2, Elizabeth has a vision of Jack on a plane and doing the hijacking -- Ooooh, look the plane is empty ? Flying across the Atlantic and it is empty of other passengers ?? Convenient ? It's probably to avoid hinting what's really happening there. This is dodging the fact that Jack ( soon to be YOU the Player) is/has committed mass murder before YOU even start -- by him hijacking and crashing the plane and killing everyone else on board ( at minimum the flight crew he killed anyway ).
But, But, But, he's gonna save Sally... Or Not - he might suck her brains out to get ADAM - they (and delusional Elizabeth) don't know WHAT YOU were going to do in BS1/BS2.
Alternately, it is cuz they did not want to have to render all the other passengers who beside screaming alot and getting empathy from the Player, might also step in to seize and beat Jack to death and string up his corpse with his own intestines. A nice short scene - just a nice short, largely unexplained, step (scene insert) of story. 
Lets ignore him crashlanding the plane right AT the Lighthouse after getting a piece of paper with some coordinates on them. Convenient, him being the only survivor, but truly horrific would be the floating tangle of bodies/seats/luggage he would be trapped in. You should see corpses, in that horrible scene, floating about, crushed/bleeding/drowned. But there are virtually no bodies floating about ( having some being little children would magnify that horror too ). Only a few bits of luggage in the original. BUT there's enough suitcases seen sinking, so there MUST have been more than a few passengers killed, but that's sidestepped quickly -- Don't want Jack Traumatized so that he can look on wonder at the Lighthouse. 
SO hey Ken, you have US playing the dirty murderer bad guy/monster. No matter how you try to hide it, it comes out pretty clearly. Oh, but remember 'Ryan' is the real bad guy right ?? Rich, Capitalist, someone who built a city and achieved great things, your story puts him in his place, right ? Atlas/Fontaine the sociopath is revealed, yet plays 'pattycake' for the rest of that game, but it is never really emphasized that HE is the evil destructive maggot which civilization can do without, and he made US (Jack) just like him. 
Psychology much ? Apply some Freud here ?
A symbolic point MIGHT have been made : Fontaine IS for all intents and purposes Jack's Father - There are those who Build and those who Destroy, but Any 4-year-old mentality or moron can DESTROY -- and Kenny, YOU decided THAT would be THE PLAYER'S Role. 
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Consider that YOU, when you crash the plane, are intentionally not made aware that YOU just murdered a planeload of people -- BEFORE you even start your murderous mayhem within Rapture. THAT brings into question anything you see in the game, as it may just be similarly missing with similar lapses in awareness -- about events you ARE still present for ...
Consider : You 'Fade Out' each time you murder Little Sisters ...
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SO YOU (Jack) are a Mass Murderer ??? :
Where are all the bodies from flight 401/whatever ? Apparently Jack USED that Gun and got them all killed (Fontaine is liable for this too). And so, Jack is a Mass Murderer from the very first scene. 
It is something to consider for when you think about deserved endings. And maybe how potentially WE could have had a VERY INTERESTING game 'mental shift' right there ( IF the writers weren't so all out bent on their simpleton"Luke I am your Father" - a cliche used by hack writers ad nauseum 'Twist' being rammed down the Players throat ). Ryan don't look so bad now, does he Ken ???
Bodies (or parts of them) floating/drifting down with the luggage, and others still strapped into the tail-section we climb through would have been gruesome. Where are the Half-eaten bodies - close ups of some crabs making a snack of one passengers eyeballs ( preferably a child's) right outside the viaduct window. Showing YOUR (Jacks) crime made plain - actually "Push your face into it" might have been an interesting prelude to the real story. 
Then disclose gradually that Atlas isn't who he claims to be and is actually behind it all and following him might not be too smartRomanticizing 'rebel' anarchists is one of the dim dumbed-down pablum being done so much today - pretend Robinhoods and 'resist' 'punk' themes -- When the more sophisticated trends have more-honest grey ANTI-Hero characters - disposing of the old ideas of 'good in everyone' balancing the terrible evil they do.
Yes, this realization kindof shades things when you look at it from THAT angle. So who still has any empathy left for Fontaine/Atlas -- WHEN you shouldn't have any for this hardly 'innocent' character YOU play ?. YOU ARE THE ONE WHO ENABLES RAPTURES DESTRUCTION BY ASSISTING THE CRIMINAL FONTAINE TO MURDER RYAN - YOU the Player were TOO STUPID to realize it ( or at least the Writers thought so ).
SO if YOU use the alibi that YOU are merely a Pawn - the writer's dupe - a Puppet acting out your non-Choice role in a forced/contrived dystopic story, and it is MORE CLEARLY the WRITERS who destroyed Rapture.
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Survive This Sucka !!! :
NOONE else survived the Apollo Air Flight DF-0301 plane crash ? ( Usually the safest part of a plane when it crashes is in the rear - not the front/cockpit where Jack would have to be flying it - Smacking into the water usually results in the plane being pulverized ). Did he MURDER everyone else on board first ??? Thanks Levine - making the Player a Mass Murderer even BEFORE we start slaughtering people in the game. 
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 Second of Three Splicers Says : "THAT'S THE ONE ... GET HIM !!!!!!" 
Other Splicers might have been sane enough to talk to the Player, if Jack didn't have a 1000 ADAM Bounty on his head.
"If you're going to shoot, shoot, don't talk!" -- Tuco ( in "The Good The Bad and The Ugly" ... )
Some people out to get Jack might even NOT have been Splicers ( others, less insane, who kept Rapture running for Ryan ?? ) You can buy alot of tasty Fish for 1000 ADAM.
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Jack's ADAM Pre-Conditioning :
Jack may have come to Rapture 'pre-loaded' with an ADAM genetic framework/structures ( he was 'speed grown' after all in Dr. Suchong's lab ) to facilitate his Plasmid use. Most Splicers have very few Plasmids/Tonics, so Jack needed something to allow him (YOU) to have several at a time ( Perhaps Fontaine used the same 'framework' on himself to be able to use so many ).
Those ADAM applications would have been carefully (manually) administered ( likely by Suchong ) over and extended time ( not just all of it being done via some Insta-Application from a Vending Machine or a 'shop' ).
BTW - With those Gatherers Garden vending machines selling so many wonderful Tonics and Plasmids, shouldn't we have seen MANY MORE varied well equipped Splicers ?? 
(( Excuses might be made in the plot, but the main reason is : Such 'Advanced' Splicers would have been far too tough as opponents for the game's Pop-A-Mole playstyle, AND it would have required ALOT of VERY HARD programming to make the Splicers correctly use their Plasmids tactically ( including in their various combinations - ONE TWO PUNCH !!! ). Tonics would have bee a bit easier, being only defensive activations, but again : TOUGHER SPLICERS. Of course, Columbia had this deficiency even more egregiously. ))
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Scene Where Jack First Meets Tenenbaum and A Ready-to-Harvest Little Sister : 
The 'nice' man Atlas is telling you to go get ADAM and that the Little Sisters aren't human any more ( so kill them ... ) It is disclosed that Tenenbaum made them ( not mentioning that he as Fontaine funded her and probably made the decision to make the whole child abuse/slavery thing happen ... )
Not too long previous, he was saying how ADAM drove everyone in the city insane, how addictive it is, etc ... NOW He wants YOU to Splice up (further) to 'save his family' -- Yet why hasn't he bothered to do this himself if he cares for them ?? ( At what point did YOU start to get suspicious about him ?? )
Not that you can do anything about it. It matters not if you figure out something is wrong, and that Atlas might not be the person you want have telling you what to do. ( Shallow stories are all that is needed for a shooter/blast-fest game after all ).
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MMORPG alternate plots for BS1 -- "Hello, this is Andrew Ryan your Father, I've had you deprogrammed and now you can decide if you want to go get Atlas, since he is Fontaine ( as he himself told you ) while betraying you six different ways from Tuesday. ***HE*** is the one who brought murder and destruction to thousands in this City, and has already tried to KILL you -- once he no longer needed you. BTW, don't feel bad, as I already had figured what he was upto. That Control 'Key' he has is worthless, and is only signalling me where he is right now. DO you want to go take care of that evil piece of shit ? Then come and have a talk with me, son." 
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Jack 'Conditioned' :
Consider that Jack was a 'Blank Slate', and what little he ever 'was' had to be created in such a short time. Maybe a bit broader (and longer) conditioning than a Big Daddy might get ( who had remnants of a personality built already ). REMEMBER - It all was seen only through YOUR unrealizing game perception, and it hid the actual simpleness of his mentality. 
Those flashed memories didn't even have to register/be interpreted ( as we do, with our decades of experience in the complex world ) other than as some positive image for which reinforcement conditioning was done :
"Look At The Pretty Picture Jack - Good Here's a Jellybean " ... "Look At This BAD Picture Jack *zzzzzZAPPP* ". 
It filled in a gap/void in his psyche - all nice and reassuring because that was what it was conditioned/shaped to be. What exactly it was really didn't matter. Physical coordination might be accelerated ( most kids get most of it before they are 10 ), but an adult mind takes far longer than that. 
What about Jack UNDERSTANDING the actually meaning of all those long words Atlas is spewing at the Player ?? It really might be little better than a 4 year old being conditioned to *TRUST* that particular voice ( and to DISTRUST Ryan's ). It may have really just been heard as "Mwuh mwah, mwum mwum mwum, mwah mwaah." ( like the parents/teachers talking in those Charlie Brown Specials ).
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Co-inky-dink : A "Jack" In Playing Cards Has The Position Of A 'Prince' ( Jack being Ryan's Son ... ) :
Coincidence ? There's no evidence this was intentional ( though Kennyboi might declare it 'prime' any time now ). It would be a minor cleverness ( quite lost on the fanbois, unless it was 'pushed into their faces' and explained to them ).
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Jack the ADAM Junkie : 
Why Doesn't Jack Become a Splicer ??
First HOW COULD YOU TELL ? You don't see him to see if there are any changes. You don't see Jack directly in the original game, so any minor face/body 'tumors' aren't evident. His hands being the part you usually see, and then they are warped by the Plasmids he is using anyway ( hands get mutated by ADAM Plasmids ).
Crazy part of being a Splicer ? He walks around slaughtering people wholesale, that sounds alot like typical Splicer behavior to me.
Jack isn't really there in Rapture for very long (unless you really like continuing conversations with lots of homicidal Splicers, and stop alot to hobnob while enjoying each spots ambiance) so the genetic damage might not be showing yet. Repeated ADAM use is mentioned before sideeffects are noticed, else most people would never have used it if the tumors and such manifested themselves that quickly). We (Jack) keep pumping ourselves full of more ADAM over a time period that is mere days (or hours). The game's excuse of why Ryan simply didn't ban ADAM ( and throw Fontaine in prison for intentionally poisoning people ) was supposedly that it took so long to manifest itself ( You would think that at least a FEW early heavy users getting diseased/mangled/insane would have made the newspapers, and scared the hell out of most Citizens from even touching the stuff, and actually MAKE Ryan regulate the stuff as a public health/safety measure ).
Somewhere it says that you start to mutate when you don't keep taking ADAM ( It is more likely your original genetics try to reassert themselves and so conflict with the partial RNA still activated by the remaining ADAM ).
Later Plasmids/Tonics may have been improved under Ryan's research - It is not like Ryan would want MORE crazy deformed people in Rapture, when his intentions were rebuilding his city. Fontaine's "army" monster sauce ( aggressively mutatious 'Combat' Plasmids, probably made with shortcuts and missing many stabilizing components ) would have eventually run out as Atlas didn't have as much resources anymore to produce them. Canon-fodder against Ryan's greater resources and better organization. How well do you learn to use a combat Plasmid when you can't waste it on training, and you don't last long enough to gain experience ?
Jack is also not a normal human, he was bio-engineered ( with Lot 111, etc... ) by Dr. Suchong. This might allow resistance to mutation and insanity, etc ... from using ADAM. Atlas would not have wanted his assassin (Jack) turning into a crazed Splicer before Jack got to Ryan.
Again, how long it takes to become freakish looking and/or insane ? We aren't really told ( indirectly you can infer it doesn't happen too fast ) and there no doubt are variations of reaction depending on how much ADAM used, which ones, Tonics vs Plasmids, how frequently, what is mixed, and some people likely being more/less susceptible, etc ...
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MUTANT Jack Might Somehow Not Affected by Massive ADAM Use ? :
The detrimental effects of ADAM require long-term use, not just a large quantity.  Like how alcohol makes you sick with a large dose in a short term, but long-term use is where the real bodily damage comes from ( though you can poison yourself with too much alcohol and die from it ).
Detrimental effects might largely start after the ADAM in your system ( or whatever changes it makes/it is converted/breaks-down to ) wear off, and your natural genetic patterns start reasserting themselves.   Now you have conflicting DNA patterns which interfere with each other, resulting in the tumors and damage that causes insanity/etc...
The more repeats of ADAM used, the more DNA garbage accumulates ...
Jack likely didn't have time to have the Plasmids/Tonics decay ( the events of BS1 were likely just a matter of days at most ).
It is also possible that Ryan, once he took over [Fontaine_Futuristics_( game_level)|Fontaine Futuristics]] (and thus a larger portion of Rapture's ADAM product production ), started having them produce Plasmids/Tonics of better/safer Quality, maybe with the features 'built-in' to (try to) minimize the side effects -- After all, WHY would Ryan want more insane people or citizens of HIS city dying ??? ( Fontaine really hadn't cared - he wasnt planning on staying ).   
Jack got his Plasmids/Tonics (the better quality stuff ?) mostly from the Gatherers Garden machines which were Ryan's system ( There's an Audio-Diary by Ryan about Fontaine not knowing how to properly market Plasmids somewhere, and perhaps that included QUALITY as well ).
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You are Made into a Murderer ... Killing For Sander Cohen :
You (as Jack) actively set out to hunt down and kill the 3 people Cohen wants 'for his Masterpiece'. It is not as 'incidental' as exiting the one path from the initial Bathysphere Station and the Splicer guy goes straight at you ( after throwing some flaming furniture at you ). The funny thing is : Cohen ( The biggest monster of all besides Fontaine ) is the one they give YOU a choice of killing HIM or not. 
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Logic is One of those Philosophical Things - Ain't IT ??
OMG OMG RYAN IS GOING AGAINST HIS PHILOSOPHY (Pheromone Control DERRRRP!!! ....), and then kills himself because the Brainwashed tyke Jack is a failure of 'Free Will' ( Consider Jack is a mind-controlled test-tube creation with GENETIC controls embedded in him to force compliance to Fontaine's orders - WYK ) -- Hardly what you might call having 'Free Will', yet the writers sail on in their 'Story' with their gross abuse of common sense Logic.
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Baby Jack's (His Mind) Growth Acceleration  :
Unfortunately forming a brain's embedded mind is not genetic - it is based on sensory input formed patterns ( including time to correlate the inputs and to take action to seek resolution of detected contradictions ).   Even just training muscles for use requires substantial accumulation of 'experience'.
Brain Boost ( or something like it being used ), being a Tonic, might not be as severe a treatment (?) - thus have less ADAM side-effects  ( Why Jack isn't already a "walking Tumor" by the time the game starts ... )  Brain Boost could work via Stem Cell reversion of brain tissue to allow reforming new synaptic patterns and some acceleration of cognitive formation (mentioned above).   Unfortunately, you can lose what the brain cells already have in them (established patterns) with that process, so a moderated mechanism is really important.  Baby Jack would be being formed "from scratch", so it is not as much a problem.
Accelerated learning/conditioning - what kind of mind is formed by an artificial process -- only what is fed into it and the immediate environment.   WE as Jack might not have understood much of what we saw in the game ( and ignored things that actually were there - simply because we had no concept to use to interpret - would make for a rather bland experience - more like an old style low detail game terrain - yet that might make for an interesting 'different' role experience in the MMORPG - even as part of the 'Cure' where ex-splicers (Player) experiences having their mind rebuilt ).
Atlas uses lots of colloquialism which would have HAD to have been part of Jack's conditioning, in order for Jack to understand what Atlas was saying  (or he really just heard "Whaaa Wha, Whah Whah Whah Whah Waaaaah, Blah Blah Blah").   Considering how extensive the total human experience is, and how much input would have to be forced into Jack, he would still have had substantial gaps and deficiencies.   Now that's something to delve into for the BS1 recreation in the MMORPG  - to hear Atlas speaking in what we think are mumbles, alot,  when he goes off-script ( and hits the limit in Jack's conditioning ).  
As rapid as Jack's mind was 'grown' there had to be many gaps.
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Jack Waiting Up On Surface ( To Be Activated )
If he was given a personality ( of sorts ), he had to be kept busy ( couldn't be kept in a box ). But then, with the 'Mind Twisting' ( conditioning ) the game shows, Jack possibly could be 'activated/reset' to disconnect him from his 'waiting' time. Of course inactivity is bad for the health, so he would have to have regular exercise just to stay 'normal'. Hmm : "Toilet Training the 'Ace' " - Another wonderful Suchong-made Audio Diary ...
Creepy : If Jack spent most of the that time up there watching ~1960 television programming.
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Sorry - 'Evil' Jack Ain't Got the Nuke :
It is unlikely the US Navy would have had a Ballistic Missile Submarine investigate a plane crash as seen in the 'evil' ending of BS1.  Deployed in 1960 (with Polaris Missiles) in the middle of the Cold War, a 'Boomer' would never be used and leave itself vulnerable in the way portrayed. ( Neither would they have a Hunter-Killer sub do such a mission ).   The US Navy had plenty of other surface ships to use for any such investigation. ( SO no Nukes for Evil Jack - Sorry ---  one of the US Navy's nuclear depth charges would probably do in Rapture quite nicely ).
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What did you THINK happened to get that Sea Slug ??
Ken Levine made the Players into Mass Murderers. Why so squeamish then about killing a few Mutant Children ???
Why Fontaine would risk his own neck by NOT having Jack have the Maximum ADAM (allowing this so-called 'Choice') is a major story contrivance.
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Excerpt From http://tvtropes.org/pmwiki/pmwiki.php/WMG/Bioshock    :
Jack isn't actually Ryan's son, or the child that Fontaine and Suchong grew and programmed... He's just an escaped mental patient who does what people tell him to.
While 'Jack' did obey Fontaine's and Ryan's orders when he was given the 'Would you kindly' phrase, he also obeys Dr. [[Langford[[ to get the rose, Sander Cohen to kill some people to get their pictures, Peach Wilkins to risk his life to get a camera and take photos of Spider Splicers, and Tenenbaum to have himself turned into a Big Daddy simply to get through one door when he could have tried using dynamite instead ... all without one of them using the code phrase.  It is quite possible that the 'real' Jack tried hijacking the plane only to have a demented mass murderer eat him and wear his clothes.  
Then 'Crazy Jack' went into Rapture and pretty much filled the same role as the 'real' Jack would have, that's why Fontaine failed was because his supposed puppet wasn't really a puppet ... just some crazy guy who kills people as soon as look at him unless they ask him to fetch stuff.  'Crazy Jack' is probably a drug addict since he has no qualms with sticking random needles into his arms.  The reason the Bathyspheres let Not-Ryan-Son move around : because the so called 'sensors' ( locks which were intended to excluded anyone except Ryan from using them ) were made by the 'lowest bidder', and just let almost anyone move around in them ...  SO Atlas could move around to help you, and Sander Cohen could mess with them as well.  The heart troubles from the "Code Yellow" phrase was just the natural result of all that splicing and eating cheap food off of burned corpses catching up with him ( Tenenbaum's attempt to remove programming from his brain that was never there in the first place - that might have been a factor as well ).  And Ryan wasn't actually controlling Crazy Jack during the cutscene ...  Crazy Jack was just 'playing along' until Ryan asked him to beat his head in.
But then how would he be able to use the Vita-Chambers?  -  He doesn't.  He's just imagining them because he's utterly insane. That's why nobody else mentions or uses them.   Suchong mentions the Vita Chambers in a recording, but he thinks they're a half-baked idea, and more an automatic massage machine.  They may have indeed been yet another failed experiment, but Crazy Jack nonetheless believes that they help him.   If he saves the Little Sisters, it is not because of any sudden attack of conscience, but because he's a psychopath who wants more playthings when he returns to The Surface.
... Twisted
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Scene You Never Got to See :
After Jack ( rather AFTER the Little Sisters drain Atlas/Fontaine of his life-sustaining ADAM goo ), then Ryan appears and promises to "get Jack help", and then cuts Fontaine's head off and comments about "Having a nice place to put it". So Jack is subsequently deprogrammed by Ryan's experts (taking a while), and is sent away to the Surface, while Ryan sets out to "Save his city".
Is THIS the 'Bad' ending or 'Good' ending ? Isn't Jack at that point 'a major headcase' with all the ADAM he ingested in such a short time ? He couldn't even tellLike previously he murdered a whole planeload of people that he 'killed' a rather poor animatronic dummy of Ryan https://rapturerebornmmorpg.fandom.com/wiki/File:AnimatronicRyan.jpg https://rapturerebornmmorpg.fandom.com/wiki/File:Animatronicryan.jpg https://rapturerebornmmorpg.fandom.com/wiki/File:AnimtronicRyan.jpg when WYK-ordered-to by Atlas. So all the other hallucinations of a giant Charlie McCarthy Climbing the Empire State Building carrying Fay Raye ( who for some reason looks like Jack Black 'in Drag' ) weren't overly real either... Well, that's what happens when you try to 'follow the story' of 'mental' people.
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Jack the Insane ( 'Spliced Up' More than Most in Rapture Ever Did ... ) :
First, how could you tell ? You don't see him to see if there are any changes ( his hands being the part you usually see, and then they are warped by the Plasmids he is using ).
Crazy part of being a Splicer ?  He walks around slaughtering people wholesale -- Sounds alot like typical Splicer behavior to me.
He isn't really there for very long, so the genetic damage might not be happening quite yet  ( repeated/long/excessive ADAM use is mentioned, else most people would never have used it if the tumors and such manifested themselves that quickly ).   Somewhere it says that you start to mutate when you don't keep taking ADAM ( more like your original genetics try to re-assert themselves conflicting with the partial RNA in the remaining ADAM ).
Later Plasmids/Tonics may have been improved by Ryan's research - It is not like Ryan would want MORE crazy deformed people in Rapture when his intentions were rebuilding his City.
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Jack Was Trained By Papa Suchong to Be Tidy :
I find myself picking up corpses, piling them up, and then burning them ( using any convenient fire ) to neaten up the areas I'm in - For BS1 it might be something the fastidious Suchong imprinted into Jack  ( and a Big Daddy's job is to clean up Rapture, so the same attitude might be an option for Delta and Sigma - AFTER a Little Sister recycled any ADAM ).
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Jack the Child/Empty Head :
If 'Jack' is 4 years old by BS1 ( ~1960-61 ) then that places his development starting 1956-57 which is rather early in ADAM's development. This affects the availability of Brain-Boost-like tonics and such needed to 'program' Jack to be anything more than a rather useless ~4 year old mentality.
See : Jack on the Airliner suddenly jump up and say aloud to himself "I'VE GOT TO GO POOPY !!!" to the alarm of people around him in the plane. The subsequent embarrassing scenes when he goes confused into the plane lavatory, for which he never really was 'conditioned' into knowing what to do with ...
We can laugh at exposing the simple-minded assumptions being made in those game plots.
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The Adventures of Little Jack :
The various happenings and odd occurrences involved in Jack's creation and conditioning, and being sent to the Surface World to wait for his activation and return to Rapture.
Lots of misunderstandings - Jack after all IS (at the time of BS1) still a 4 year old, and his mental growth is hardly comprehensive for dealing with the real world.
False Memories - Jack doesn't have a real life to compare them to, so wouldn't know how spotty they are, or much of the importance of what they represent. The images don't really mean much if he never experienced them and everything associated with them - just some vague feeling applied as part of the conditioning. ( Lets include humorous odd 'flashbacks', which in error happened to be part of his conditioning. )
You (as Jack) don't speak in the game. Maybe it was a good thing you didn't. That's a skill that takes a real human decades to master, so maybe you can't ( or he only can talk like a 4 year old, which would be potentially quite humorous ).
Break That Sweet Puppies Neck
Oh, and don't forget all the 'failures' which happened to develop 'Jack' - How many little bodies went into the crematoria or were left in large specimen jars in Fontaine's laboratories ?? Wouldn't THAT have been something shocking for Elizabeth to run into ( instead of that ludicrous scene in Fink's research lab ). There might be Suchong's and Tenenbaum's Audio Diaries about 'dissecting the subject' to see what 'went wrong', again. This kind of realistic "try try again" Trial and Error process would require cloning Jack's Embryo, which might not be so difficult with the help of ADAM, etc ...
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Fontaine Said None of Jack's Memories Were Real :
Sufficient techniques to manipulate Jack were similarly used later for Little Sisters ( to condition them to drink rancid goop from corpses ). Nothing says that Jack's conditioning was exhaustively extensive ( ie- to act much like a human ) - It need be only enough to do what Fontaine required : Get him on a plane, Move through Rapture and Kill things.
Such conditioning was used also to Program Big Daddies ( originally physically damaged volunteers or mentally insanes being made useful ... ). Likely it was much more extensive for them since they did complex repairs.
Delta/Sigma 'repurposed' by Tenenbaum. Eleanor perhaps using similar methods to rebuild Delta to be her savior.
The Rapture Family members possibly submitted to (forced into) conditioning by Sofia Lamb ( were those ones seen nailed to the wall the ones who managed to resist ??? ).
Images, sounds, drugs, ADAM mutagens ( and a largely empty brain to start with, in Jack's case )
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Jack While He Was Up Waiting On The Surface :
If he was given a mentality/personality (of sorts), he had to be kept busy. But then, with the mind twisting the game shows for him, he could be 'activated/reset' (Code "Gorgonzola IceCream") to disconnect him from being disturbed/affected by his 'waiting' time. Creepy, if he spent most of the that time watching ~1960 television programming (up there).
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'Good' Jack had to do somethings for at least a decade while those Little Sisters grew up ( before the poignant deathbed scene ... ). 
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Jack Decides to "Save" a Little Sister using the Plasmid Tenenbaum gave him ( It is not made clear if Tenenbaum had 'Spliced' Herself with the same thing ).
What this did to the embedded Sea Slug wasn't made clear, but likely the act of nullifying it was not overly pleasant.
Question : Why is Jack here Frying the LS's Head ? ( Mark it upto Game Animation Limitations ... )
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One of Suchong's specialties was 'Conditioning'.
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