Somehow, I doubt a HOLOCAUST SURVIVOR would ever consider imitating the Nazis.
And besides, Magneto's never been about committing anti-human genocide. He's about Mutant Dominance. He won't hesitate to kill a thousand humans if it serves that goal, of course. And he'll certainly kill a thousand humans in retaliation for the death of even a single mutant. But he's not about killing humans just for the sake of killing humans. He's more then willing to let them live in peace... ...Under mutant rule.
Now House of M, THAT's what Magneto's vision is supposed to be. Not that crap Xorneto did.