I think it’s difficult to know if someone is genuinely a psychopath. I say this as someone who has grown up with two parents and a sibling who are all Psychiatrists and as someone who has been around more mentally unwell people than mentally well people.
I have a relative who has undoubtedly got Narcissistic Personality Disorder. Many “lay people” have referred to her as a psychopath. She’s definitely not a psychopath.
I have a colleague who has BPD who can, about 10% of the time, behave in a psychopathic way. It’s horrible to be on the receiving end of and quite chilling. The other 90% of the time she is wonderful and she’s a very caring and empathetic person. No doubt people she went to school with would have answered that “I went to school with a psychopath” as her behaviour was very destructive as a teenager, but, again, she is not a psychopath.
I think it total I’ve only met 3. Amongst an array of very fucked up people that I know, 3 is a really low number and, most importantly, none of those 3 were in receipt of any mental health intervention or had a history of “mental illness”.
What they all had in common? Charming, extremely charismatic, hypersexual, exciting, risk takers, Machiavellian, liars, massive frightening outbursts when told no or challenged, controlling, manipulative, tries to latch on to kind, empathetic people but humiliates them for being “weak”, calculated - made me feel extremely uncomfortable without knowing why (and no one would believe me if I said there was something “off”).
Two were women, one was a man, all were wannabee actors, the man was a genuine paedophile who was never convicted because the victims were “unreliable witnesses”, the two women were sexually predatory towards both men and other (straight) women. Got the sense with all three that they were very dangerous people and that it was extremely important to keep my distance. Coincidentally, all three went on to “blacken” my reputation in some way when I distanced myself from them.