Psychopaths can just as well have morality systems… they will just look very different from yours.

Morality is ideological definition of right or wrong. To you, scamming someone might be wrong. To a psychopath, getting money from a sucker who’s less smart/strong/awesome than you is right.

Might makes right is a moral system… it might be “imoral” to you, but it’s a moral system nonetheless.