He's really sort of the devil. He's completely emotionally detached. He has no empathy. You find that in psychopaths. It's about power with Voldemort. It's an aphrodisiac for him. Power makes him feel alive.
“There are always great dangers in letting the best be the enemy of the good.”
“Nature is the mother and the habitat of man, even if sometimes a stepmother and an unfriendly home.”