First of all, if you have to READ SOMETHING to tell you that F'ing a picnic table is deviant than you are clearly a little slow on the uptake Fez.
Secondly, I was using what I know of serial killers (as you point out) and applying it to this case. I think APJ has demonstrated that he was on a path of increased depravity and perhaps the police nipped a potentially dangerous perp in the bud. According to the story, first he was seen masturbating inside of his house within view an open doorway, then with the table inside, and when that wasn't fun enough, he moved his act outside in view of his neighbors and close to an elementary school. If you are so certain that this wouldn't escalate to anything, then why not prepare your guest bedroom for a visitor in 6 months?