Getting into the mind of a psychopath

[abaris]

I imagine it's a much more efficient existence in a lot of ways; a high-functioning psychopath can thrive in the human environment, selection works in their favour.

Obviously not. One or two may thrive but if selection really worked in their favor we would all be sociopaths by now. We are a social species and as such required to work together and not in the sense of using and abusing each others. Our societies would crumble if that was the norm.

And it's important that in the overwhelming majority, psychopaths are made by childhood influences and aren't born that way.