Protectors Too Soon

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The "Gathering" Conundrum ? : 
Rapture's stable situation BEFORE the 'civil war' itself would precluded the LS/BD existence/activity as being TOO EARLY ( We gots no tons of abandoned corpses yet ) -- Early existence of Gatherers as was illogically shown in the Canon-breaking Burial At Sea DLC. That cutscene 'evidence' can be reasoned away for the most part.
What happens LATER (Post 'civil war') when there aren't enough tasty corpses for this kind of ADAM recovery/production ?? Perhaps one solution was that corpses could be harvested multiple times as the ADAM in their decomposing system was freed up (putrification), or simply continued to be generated from the tumorous tissues within them. It would explain so many corpse just laying around for so long in all the games.
As 'ruined' Rapture's population decreased ( or the fighting waned by BS1 times ) there would simply be fewer corpses to 'Harvest' by the Little Sisters, leading to less and less effectiveness by whatever Gatherers and Protectors remained. With the Population drop, you might assume the need for ADAM likewise decreased. Eventually (post-Ryan) organized maintenance of the LS/BD would also decrease significantly.
Then there is the long interim ( 6+ years ) where the surviving Little Sisters age into Big Sisters, yet where are any replacements to be found ? BS2 + SitS (Meltzers investigation) doesn't show a pattern of 'child stealings' from the Surface until very late. Harvesting may have largely ceased in much of this period ( and even ADAM use declined drastically ).
With Sofia Lamb's Utopian project, there would be a resurgence of the need for ADAM ( likely now PUSHED onto the population Lamb controlled]]), thus leading to the Surface 'child stealings' starting close to the time of BS2.
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Needed for MMORPG : A touching scene of the faces (and comments) Little Sisters make after Harvesting rather ripe corpses, and their Big Daddy offering them a Mint to offset the bad taste ...
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An interesting thought (Plot Breaker) is : If they could do all these other wondrous things with ADAM, why not genetically modify the Slugs to produce more, OR find a way to synthesize the relevant bio-chemicals which cause the same effects on the human body ?? The gene changes seen for many Plasmids and Tonics are AT LEAST that complicated.
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Lil Doc and Nurse :
The Audio Diaries and Public Announcements actually expressed that 'disquiet' the population had about Little Sisters, even with Ryan saying so to himself in one. LINKY It just doesn't seem to correlate with the other simultaneous descriptions/story-info you get in the game ( Like the logic requiring 'sufficient bodies' to be laying about in parts of Rapture -- enough to warrant the project to create Gatherers -- and then the Protectors needed for them. ) 
Though an imaginative solution might be : That it was started MUCH earlier as some way to extract the deteriorating ADAM from an increasing numbers of APPREHENDED dangerously-insane Splicers ( as a partial cure, or at least a way to 'disarm' them ) -- A BD 'nurse' to hold-down/restrain the living Splicer 'patient', while the Lil Doc did her extracto thing. Of course this would be at some designated location where apprehended Splicers would be taken - Persephone ( I don't see a likelihood that Big Daddies would be used to chase down crazed (live) Splicers in the Streets, for the 'Lil Doc' to neutralize. )
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"Nurse Ratchet" Nurse Ratchet - reference to a character in 'One Flew Over The Cuckoo's Nest (book, play and movie)- a 'BD' in a nurses uniform - That should give you nightmares.
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