Jason Voorhees has an insatiable addiction to killing people... poor guy. He's pretty much exhausted all the murdering varieties available to his limited intellect, and it wouldn't be surprising if he were just fed up with the whole song and dance. Putting a knife in someone is no small thing, but for an old pro like Jason, it's just feeding the monkey. What this guy needs is a nice desert island where he can relax without anyone coming along forcing him to continue his tedious killing spree.