How we cite our quotes: All quotations are from The Avengers.
Quote #1
CAPTAIN AMERICA: You know, the last time I was in Germany and saw a man standing above everybody else, we ended up disagreeing.
Cap's the master of understatement here, but linking Loki to Hitler is no joke. He knows what it means when one man tells everyone else to bow. It rarely ends well.
Quote #2
THOR: This is beyond you, metal man. Loki will face Asgardian justice.
IRON MAN: He gives up the Cube, he's all yours. Until then, stay out of the way, tourist.
The disagreement here isn't so much whether Loki should face justice, but who should do the justice-ing. It's basically a jurisdictional issue, which is why these two super-sized egos can't get out of each other's way. (At least Cap is smart enough to keep it humble.)
Quote #3
STEVE ROGERS: Now, I don't know what you plan on doing here.
THOR: I've come here to put an end to Loki's schemes!
STEVE ROGERS: Then prove it! Put the hammer down.
TONY STARK: Um, yeah, no! Bad call! He loves his hammer!
He really does. Again, Cap is the one calling for justice, while Thor—though his heart is in the right place—insists that only he can deliver real justice to his brother. That's the ego talking, not the need to follow a higher principle.