Each main Legend of Korra villain represents a different political ideology.
Even the more minor villains like Varrick (who started off as a villain but underwent character development) and the Earth Queen represent ideologies as well: Capitalism and Monarchy, respectively.
Each avenger goes through a simulation in which they try and play the role of a super villain as the others try to defeat them. Tony wipes the floor with them with simulation Ironman Suit access and without. Maybe they try to warn people and Fury is like, yeah we knew that ages ago... you guys are thanking him and stuff, right? And they've all gone very pale :)