Back when America could do no wrong, America was Rocky, or one of those glistening 80s heros. Maybe a bit flawed, but generally a family man vs. evildoers, a plucky little upstart.
Then America was Bruce Willis in Die Hard, rough around the edges and divorced but still a good guy, trying to do the right thing. Then America was Keifer Sutherland in 24... somebody's gotta do the torturing! For a good cause, though.
The more and more dirt comes out, the more public sensibilities turn to stuff like Breaking Bad and Game of Thrones and House of Cards, reassuring watchers that nobody's good, that if you try to do the right thing the world will crush you, that all that matters is being top-dog. Sucks, but "that's the way the world really is".
It's super interesting. You'd think the character development in those shows is indicting, but it really is mostly immunizing and pride-preserving.