I try, and I think I succeed, in making my readers feel sorry for my psychopaths, because I do.
It's living - a broad spectrum of living - that teaches you how to live, not philosophy. Philosophy teaches you how to think.
I think about death every day - what it would be like, why it would happen to me. It would be humiliating to be afraid.
I think to be driven to want to kill must be such a terrible burden.