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.
I could have started a for-profit, venture-backed business that has a good spirit, and I think there are many of them - Google for instance. Maybe I could reach a billion people. That is high impact, but what happens in 50 years?