If Erik has spent his life tracking the mutants who killed his family, doesn't it undercut the idea that he's reacting to persecution from humans? That he spends his life believing he's defending mutants from humans?
Wasn't he tracking down the people
who killed his family? I mean he didn't necessarily know Kevin Bacon was a mutant or even what mutants or people with abilities were or that there were others.
Erik told Charles that he thought he was the only one with special abilities.
The scene in the South American bar shows he was killin' Nazis while also lookin' for Shaw.
As far as he was concerned, he was persecuted by humans and killin' or torturin' anyone he could find that had to do with his persecution and the death of his parents.