It's not easy being a superhero, and it's harder to be a mutant. Being a mutant superhero, particularly as a member of the X-Men, is perhaps the most difficult of all. Despite their cheery epithet, Marvel's Merry Mutants are continually battered, facing hate, death, discrimination, and loss on all fronts.
Source:https://www.cbr.com/comic-events-that-nearly-tore-the-x-men-apart/