It's such a shame to think how many deaths Charles ended up causing. I think the movie left it vague which I enjoy. But I imagine his power ended up paralyzing everyone at the school both mutant and not and that probably led to hearts stopped, organs failing and stuff. It must have been horrible, which is why I'm sure Logan resents Charles but at the same time,
I found
this article to be an interesting read.
I also think Tony wouldn't call the mutants, mutants. I think Tony would just see them like Hulk or Hawkeye and call them heroes or something. I think he'd disagree with the title and maybe Mystique would like that he'd rather have equality.