>>108917250They're ALL mentally unstable, that's the thing.
Jamie was a pretty morally bankrupt guy (white slave trader) who was tortured into insanity and his powers just made it worse.
Proteus is driven by sheer hunger and straight up murders people and warps them for fun.
Legion is Legion.
Franklin Richards is a child, so more emotionally unstable.
Mad Jim was arguably the sanest of the lot but was pretty corrupt and his powers made him madder each time he used them.
It's all superpowers cold war and social eugenics, that's what Omega Mutants are really.