I can see how one might view the note as not particularly indicating any sort of revenge at all much less revenge against John Ramsey. And I would certainly agree that even one item of child pornography in the house would have been sure to nail the father but good!

But I don't think the intruder wanted to nail the father, I think he wanted to needle him.

Got out of Dodge? Yeah, maybe. That might be the purpose of corpse concealment. And he might have later been ecstatic to find that his ransom demand which was determined by the roll of the dice turned out to be near John Ramsey's annual bonus.

We all know there are alot of possibilities.

I do however see this crime as being quite likely to have been a grudge against the parents or one of them.