Well, strictly speaking, not a serial killer. Just a kidnapper, molester and triple-murderer. The blog of Joseph Duncan is exactly the kind of self-aggrandizing rant of denial that you would would expect:

I have feelings, in fact I think I must be more sensitive than most people because I seem to feel more than they do, at least more than what they openly express. I feel for the starving children and families in the world, others say, “Oh, that's too bad, but I can't do anything so... I wish I could be more honest about my feelings, but those demons made sure I'd never be able to do that.

Yep, you're a caring, sensitive, humanitarian friend of adults & children alike, as the record clearly shows.