@wizz Your argument makes sense, but the Marvel-verse (in all its many properties) paints the UN as a limp, bureaucratic nightmare that consistently trips over itself and makes things worse.
By the time they voted to send the Avengers into a situation there'd be monkeys flying out of asses already.
America used to be the land of individualism and freedom, sure, so Captain America is representative of that.
Current America, though... is all fear and control. Ever since 2001 we've been on a steady slide towards a xenophobic dystopia.
And don't even get into the whole 'registry' thing. Stark can take off his suit and walk around without anyone giving a damn, but you've got people with mutations/powers who would basically have to sign away their freedom if they agreed to it.
I dunno. I think the whole Civil War thing is great either way. But Stark is a giant flaming poopnozzle. (So is RDJ, but that's why they're a good fit.)