The Nazis did it

This was a great intro for Magneto, even if it relied on another cliché (death of someone loved, in this case the mother). However, it appears that every other superhero movie relies on the same principles and ideas of the despised party.

Thus, HYDRA is a branch and supports the same ideology. I guess that happens when the major antagonist of the shared universe (as seen until now) spawns from this ideology and is all about world domination. The same can be said about Zod and his plan to further the creation of the perfect Kryptonians, while literally killing Earth’s entire population.

For that matter, The Avengers (the movie in which an Asgardian, member of a superior race, was the antagonist) contains a pretty clear reference, when Loki is called out by an old German. But, after all, this ideology is the one everybody can hate.

Or maybe it isn't. All in all, this has something to do with the villains and their motivations. You'd think that in 70 years of history some other real-life evil doers would have walked the face of the Earth (speaking of which, Iron Man had an awesome chance, but blew it).