I was going to answer this post in a similar way, even though it was directed to you.
He is, without question, a murderer. But lets look at what Jaded admits he is guilty of...child pornography possession and Peeping Tom behavior that is absolutely revolting and done without the subject's knowledge or consent. I do not find a moral equivalence here and old Dave just one more average sinner.
Then add in the kidnapping, rape (yes, I know he wasn't charged with it), and murder.
Whether Westerfield is guilty is not something subject to one's "world view", not a philosophical question.