What struck me about PE's fb messages, is how unrepentant he sounds about his crimes towards that woman. Anything said about her was nonchalant, as if she was a consensual party. However, he didn't want to go to jail, so he'd decided to kill himself instead.
But then when he refers to the Delphi murders, I believe he used a term like "horrible," or something to that effect. And then he says he believes the girls were unicorns because unicorn blood extends life. In Harry Potter world, from what I've read, unicorns are innocence and purity. If you kill one and drink its blood, you live longer, but you'll be cursed. If he's assuming they were killed for their blood, than in a roundabout way it seems like he's saying the Delphi murderer is cursed for what he did.
So I don't understand why he thinks so poorly of the Delphi killer, while his own crimes of kidnapping, assault, and rape (not to mention trophy making), is ho hum.
ETA: In my head, my post was as clear as a crystal ball, but upon rereading it, clear it ain't. Sorry.