He believes in whatever he wants to believe. He has wanted to wipe out some humans before. The X-Men are mutants, and we see how he deals with them. He has his beliefs, but he's a sociopath at the end of the day and I could see him justifying such a thing. Crazier shit has been done in comics to create a large scale conflict.
I don't really think it's the best or most likely idea, I just really wanted to discuss it more
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