The most interesting part is how unlike a typical disorder it is. Your typical disorder removes capability; psychopathy removes empathy, which can be seen as a capability- but it could also be seen as a natural (well-intentioned) limiter.
I don't think it is evolutionary stable. I think a society of sociopaths would fall apart. We evolved to live in groups; we are social animals. Social animals need empathy, otherwise they are unlikely to cooperate and live in mutually beneficial ways.
