This movie from beginning to end is about the two topics of peace of mind and autonomy.
In the beginning sequence they set up the stripping away of Bucky’s autonomy and the shattering event of Tony’s peace of mind, both then and at the end.
Then the avengers are in Lagos under their own autonomy to capture Renlo.
Then Renlo breaks Cap’s peace of mind by telling him Bucky remembered him.
Wanda’s “mistake” hurts everyone’s peace of mind.
The very next scene is Tony’s spendy holodeck that he made to try and find his peace with his parents death.
Then Alfrie Woodard breaks Tony’s peace of mind even more by blaming him for her son’s death.
Then there’s a bunch of news reports questioning the right to autonomy of the Avengers.
Then there’s the scene between Steven and Wanda where he’s trying to help her find a way to live with what happened.
Then the Sec of State comes tries to break everyone’s peace of mind by showing them all the destruction that is left behind from their “battles” and tells them we’re going to take over your autonomy (the Sokovia Accords)
The next scene is Zemo collecting the what he needs to get his weapon that has no autonomy (if you speak the magic words)
The next scene is the logic debate between the team and Tony makes his HUGE switch to assuage his guilt (seek peace of mind) about giving up his/the team’s autonomy (which is the complete opposite from the first Iron Man movie)
Then Peggy dies hurting Steve’s peace of mind again, but he gets that message from beyond the grave…stick to your own guns
Then there’s the discussion between Steve and Nat about where everyone stands and her trying to offer him comfort/peace of mind that he wasn’t alone
Then a discussion between T’challa and Nat about politics and how 2 people (autonomy) can get more done that 100 (decisions by committee) As an extra side note I would like to point out the hypocrisy of T’Chaka and T’Challa, they weren’t planning on relinquishing their own autonomy over “black panther” – just saying.
And then you have Zemo’s bomb explosion his autonomous decision, using Bucky who’s autonomy he is subsuming.
So there is ACT 1…but honest ALL the Acts are looking at the same issues. peace of mind and autonomy.