Bruce: I don't think we should be focusing on Loki. That guy's brain is a bag full of cats. You can smell crazy on him.
Thor: Have a care how you speak! Loki is beyond reason, but he is of Asgard, and he is my brother!
Natasha: He killed eighty people in two days.
Thor: I once killed several of his people in Jotunheim within minutes, and, er... started a war after a centuries-long truce.
Steve: Our Allies killed thousands in the Wars.
Fury: Not much has changed there.
Bruce: I also... broke... Harlem...
Natasha: I've killed a few in my day. I mean, who hasn't...?
Tony: I've probably almost run over a few possums while drunk.