Up to the point of Thor: The Dark World, the current incarnation of the Marvel Cinematic Universe (MCU) has been, almost entirely, pop entertainment. Awesome pop entertainment, yes, with some wonderful character arcs and relationships, but anything that transcends beyond? Not much. The one aspect of the series that has been challenging with regards to modern society and politics has been S.H.I.E.L.D. - the organization that out NSA's the NSA. The organization's director, Nick Fury, is so shadowy and ethically questionable, he rides the fascism line HARD. Dealing with such a group must be a trial even for someone as strong as The Hulk.
The star spangled hero Captain America, a man left over from the WW2 generation, is especially uneasy with this group, and even more so with a world that accepts it as necessary. THIS is what he fought for?
