ITT: Plebs ask questions about characters/comics and others will answer about them

1. I've only read the more recent x-men comic books where Magneto is really more of the X-Men's wacky uncle. I have read the ultimate series though and Magneto just straight up kills a shit ton of innocent civilians in that. Has Magneto in the 616 universe ever committed any major tragedies on innocents?

2. I know he wears the Helmet because he doesn't want Xavier to fuck with his brain but does he wear the helmet when he's in the shower or taking a swim?