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.
“The whole thing means such a great deal for me, and hopefully one day it will be there. But my friends and my family mean a little more. I would rather be helping them, even if it hurts that.”