Read John Hunt's full message to man who killed his family: 'You are a psychopath' / Women can have a dark streak too: The need for more research into female psychopaths / 'Oh my god, I'm a psychopath!' How The Traitors revolutionised reality TV - for the secretly evil / The Man Who Invented the "Psychopath" / 'Psychopath' rapist who butchered woman back on streets after just 12 years of life term / Confessions of a psychopath: A SAS's shocking revelation and the dark truths of society's underbelly / Douglas Murray brands Norman Finkelstein a 'psychopath'