Lack of coherence

Rating: 4/10 (29 January 2020)

I see many people love this movie, I don't see why. It has some huge star actors, yes, but that doesn't make a movie good.
First half of it, it's so boring that I kept stopping to go do other things, and it took me 2 days to finish it.
When the movie finally gets running, I notice some incoherences on it. Cole is sent way too the past, and there's no explanation on why. Ok, I can live with this, but then he goes on a mental institution. Why in the world would he tell anybody about the apocalyptic future and that he's in the past? And who pays the bills for him to be interned? He doesn't seem to have committed any crime to be locked as a dangerous crazy criminal. I understand that, from meta, the basis for the movie is that a supposed crazy guy locked on some institution would be in fact somebody from the future warning about it, but there still needs to be a reason for him to be locked.
Then, he starts repeating that he can't change the past and can't stop the event from happening. Again, if he's not willing to undo it or warn about it, why then talk about it to anybody at all? Why take the risk?
And when things finally start making some sense, they discover who the actual terrorist is, and tries to stop him. But wouldn't that be impossible? I personally don't like this hypothesis that somebody traveling to the past is unable to change it. If that's the case, then traveling to the past would be the actual impossibility. If somehow a person can go back, he can do whatever he's able to, and with some minimal information he should indeed be able to change things and influence people. But, anyway, if in the movie that's impossible, then why try? If it's impossible, he could be just close to the terrorist, and still some mystical thing would happen and he'd fail. He just got himself killed for nothing.
Finally, the future organization that handles everything seems to be reasonably well organized on the past. They have some minimal company with a phone that records messages from people they send, they are able to find Cole from a call he did 30 years ago. Hey, the world almost ended, remaining mankind had to move underground, and still they have records of all calls done and are able to track where those calls come from? If they have this structure, why not use it to effectively track the terrorists and stop them?
No, they are more worried to spend their resources hunting Cole, than to hunt the terrorist who caused everything, or at least the original virus.
Last one, they say that the original virus mutated, and they need the original one to find a cure. From the little knowledge I have about biology, that makes no sense at all. First, if a virus mutates, the cure for its original form may stop working, not the opposite. Second, the pre-mutated virus shouldn't be needed to find a cure for the current one. Third, the few survivors should be immune from the virus, so why were they forced to move underground? Civilization should be a mess, yes, but they should be able to breath pretty fine the contaminated air.