Words like psychopath have a common usage for people not in psychology/psychiatry. I’m sorry that we’re not meeting the clinical definition that you want, but I don’t think ranting about it all over Lemmy is going to help anything.

When the average nonspecialist individual thinks “psychopath” they think of someone like Hannibal Lecter, who is dangerous and must be locked up to prevent them harming others, and that’s not going to change from a short form text post. It would take a semester of psychology.