The Auschwitz scene was his double-victim statement:
Mutants in the X-Men movies are, for him, proxies for Jews and (so-called) Gays, and a pretext for his leftist stance on both identity groups.
As such, they are presumed to be innocent, and entitled to their hatred.
Notice that Magneto, a mass murderer, is never really portrayed as an evil man.
Personally, I denounce both racial persecution and identity politics.
Notice that Magneto, Ian McKellen the actor in real life, is a homosexual...................