After they'd heard Hare speak they realized they were dealing with a psychopath, someone who could feel neither guilt nor sorrow. They changed their interrogation tactic to, "So you murdered a couple of prostitutes. That's minor-league compared to Bundy or Gacy." The appeal to the psychopath's grandiosity worked. He didn't just confess to his other crimes, he bragged about them.

Nice, reverse psychopathy.