If he is capable of tying up little girls and shooting them in the head, he's certainly capable of lying to anyone and everyone about why he wanted to do it.
I'm suggesting that in all likelihood, nothing DID happen twenty years ago. He made it up. This is a script he wrote for how he wants to be remembered. Don't give him the credit of believing him.
Never is there an excuse for this horrible behavior. But, I don't necessarily disbelieve it. Something very serious may have happened to him, couple that with schizophrenia and parnoia, no medication or therape, and you have a recipe for disaster
I agree, and even if in his deranged mind, "something/anything" happened 20 years ago...NOTHING! NOTHING! NOTHING could even remotely be used to justify this slaughter in anything except the mind of a person who has embraced the darkest of evil with his whole being.