“There’s been new research into a certain type of aberrant personality. Some call it mania without delirium, or moral insanity. It describes someone who engages in antisocial behaviour without regard for the consequences. They’re often fluent liars and seem entirely lacking in empathy. But in other ways they’re perfectly sane, capable of cool-headed planning and manipulation. The German psychiatrist Julius Koch has been doing preliminary work in this area.”
Psycopathy or sociopathy.
