When I found out about the 501st Legion, I was absolutely baffled. George Lucas dressed the bad guys to look like Nazis, and now fans were dressing up as the bad guys because they love the movies so much? What the fuck is wrong with these people?
Then Captain America came out and people started dressing as Hydra agents, and I was like, "Oh, they're just straight-up okay with Nazis. Got it."
One of my favorite moments in comics comes from the 1970 Green Lantern / Green Arrow run. Green Arrow rescues a kid from getting run over by a train, and rather than celebrate the victory, he laments that the city didn't have a park where this kid could play safely. He considers running for mayor, and the rest of the Justice League talk him out of it.
As a kid, it was the first time I saw a comic look at the reader and say, "Yeah, these capes really are just fantasy. If you want the world to be better, you can't leave it to other people."