The power creep really undermined the message. When the X-Men started the strength of the powers was more subdued. Ice Man creates ice, which he predominantly used to make ramps to slide around on. Then decades later some hack writer was all "actually, he has control over the forces of entropy itself and can destroy the whole universe if he wanted". So yeah, maybe killing mutant children before their powers can fully manifest is a good idea.

The fantasy racism doesn't really work because of that. Besides, "mutant" is such a bullshit meaningless term that undermines the sentiment of "race" solidarity and there's no functional difference between mutants, mutates, inhumans and other

DC has the right idea on how people would react to superpowered humans with Amanda Waller and her glowies. It also makes more sense having normal humans like Batman actively working along them instead of ironically, making them outsiders