What infuriates me is that you're 100% correct.

There'd be SUCH A COMPELLING HOOK in showing one of these capes that the uncritical audience accepts as a flagbearer of Amerikan Exceptionalism-- especially Captain Amerika, since DC's been getting kinda based with Supes(call the volcel vanguard on me 'cause I'd let Latino Superman send me to meet Eddie) lately-- but like, show me Captain Amerika suddenly crippled by such a daunting lack of faith in his own countrymen that it makes him retire and fuck off to some other(lbr probably third-world) country to "soul search".

From there, he's gotta walk through a frankly-Boschian hellscape of countries that Amerika has ruined and left destitute. This would be the start of a renegade Captain Amerika lending his strength to the Brotherhood of Mutants; but it'd never make it past issue #1 because Marvel would have a diarrheal conniption fit at what I did to King Big Dick of the Avengers.