Something I think about a lot with people who aren't into comics is how much that shit was built over time. I was talking with a friend about how bad Magneto used to be as a villain, just fully genocidal. And that the retcon of him being a Holocaust survivor then painted a lot of those earlier stories in a bad light.
And it was like full stop in the convo because my friend just could not grok that Magneto ever existed outside his Jewish identity, to him that's just core to the character. And like I found the issue that got revealed- it is a latter addition. It's just interesting to me because to him it's Bruce Wayne losing his parents, it's issue one stuff. And I am having to explain to him that no... You used to just have a magnetic dude in red who wanted to kill all humans. Which also now that I remember, shout outs to the first two X-Men films for fully embracing that.