I just don't GET this.

Dude. You could've run off with her WITHOUT killing her parents. Which would have had the duel advantages of them not looking nearly so hard for you, and you NOT BEING WANTED FOR MURDER. Fergawdsake. I just don't get your reasoning here. Just purely for catharsis, I guess? That's pretty short-term thinking, I have to say. Or else just because you're irreducibly not that bright? Well, okay. But either way, you don't get much sympathy from me. I mean, you wouldn't even if senselessly murdering two people were unproblematic from a moral standpoint.