Age of Ultron is actually a pretty big step as to why Stark would choose to hand over autonomy to the government, because it was his own hubris and the lack of anyone able/willing to tell him no that led to the events of that movie, many deaths, and all of humanity being put in jeopardy. I think it was the last straw for him, and while he still wants to help people, he doesn't want to be the one responsible.Zeconte said:See, as far as the MCU goes, I don't see that. Granted, I haven't gotten around to watching Age of Ultron yet, but in Iron Man, I see a sheltered playboy who lived it up off his wealth with no regard for anyone and no concern about what his company actually did with the weapons he designed for it getting a rather rude awakening to the reality of his company and deciding he needed to do something about it, because he couldn't trust his company or the military to make things right. In Iron Man 2, he continues his distrust of the military and tries to keep his inventions to himself, but starts falling into his old irresponsible ways as he's facing his own death by poisoning from the arc reactor keeping him alive. He gets that resolved and gets back on track only to be faced with the realization of the existence of God-like aliens ready and willing to invade earth that humans are totally unprepared to deal with. In Iron Man 3, he's trying to cope with how badly the attack on New York affected him and starts creating all kinds of Iron Man suits to try and occupy himself, and then gets caught up in the Extremis terrorist plot involving the Vice President, leading into Age of Ultron.
And again, I've yet to see Ultron, but I don't see Stark explicitly trusting the government/military by the time Civil War comes around, but he also has reason not to trust people with superpowers to always do the right thing either. At least from the trailers I've seen of Civil War, Captain America seems perfectly willing to go rogue in order to save his friend and fuck anyone who gets in his way. It isn't until Rhodes getting severely injured if not killed in the process of trying to stop him and Bucky that is the last straw that pushed Stark over the edge and fully against Cap. I don't know anything about some underwater supers prison and being forced into allowing the government to use them as unwilling weapons under threat of being sent there (is that how it plays out in the comics?), but that doesn't seem how the movie plays out to me and seems like it would be against Stark's character to go along with such a thing. He spent a couple of his own movies refusing to be the government's weapon, I don't see him supporting others with that kind of destructive capabilities being forced to. But I do see him saying "no, we can't just be given the freedom to run around and do whatever the fuck we want to do when so much gets destroyed and so many people die in the wake of us doing that." And it's hard to disagree that when they step up to end threats, there's a lot of collateral damage that they probably shouldn't be as completely unconcerned about as they usually are, even if far more death and destruction would have been caused if they did nothing. As Cap says at the beginning of one of the trailers, " . . . you try to save as many people as you can. That doesn't mean you save everyone . . ." but who is he to make those decisions on his own authority?
The underwater prison is shown rising out of the water in the second trailer, and you see Tony inside of it as it pans across all of the empty cells. In the comics it is a prison in the other dimension from the latest Fantastic Four movie, which Marvel obviously doesn't have rights to, so this is what they've decided to go with.
I don't see the Avengers as having ever been "unconcerned" about collateral damage, and in fact they are often shown trying to save civilians and limit the area of destruction. Instance that immediately pops into mind is the invasion of New York in the first Avengers. We are given both a scene of Cap giving some cops instructions on how best to evacuate and cordon off the area, and we're able to listen in as they enact their plan to keep the invading aliens boxed into a radius of only a couple of blocks to prevent widespread destruction.
And who is Cap to make the decision as you how best to save as many people as possible? He's a man of good heart and conscience. He's not a politician looking for re-election. He's not a General looking for a devastating victory. And he's not a weapon to be aimed at whomever the government is unhappy with that week. Keep in mind, the people you're saying should have oversight over the Avengers are the same ones that continually attack the Hulk in as highly populated areas as possible to maximize collateral damage, and whose response to an alien invasion force that they knew nothing about was to nuke one of the most densely populated cities in the world hoping that that would be able to stop them. (Spoiler: it wouldn't have.)