That's an appeal to tradition. If harassing gay people was a core part of American culture should we continue to do it? Beating up and killing people over one's political beliefs is wrong.

I think you're dramatically overstating just how integral "beating up and killing Nazis" is to American culture. I'd go a step further and say that the principles of liberty and the First Amendment are more ingrained than the notion that it is permissible and encouraged to commit violence against Nazis. Especially if the alleged Nazis are fellow Americans.

>"Is Inglorious Basterds anti-conservative? Is Captain America? "

Obviously not, and the fact that this is even being asked illustrates the concern because the association between Nazism and Conservatism has already taken root in some way. If you had just left those last two sentences out of your post, the first assertion would have stood on its own.

More communists than Nazis although we've forgotten about that unfortunately.