T4R. At first I thought it was pretty far-fetched, but as I kept reading, it seemed more and more plausible. Here's a link: http://grantland.com/hollywood-prospectus/did-kevin-from-home-alone-grow-up-to-be-jigsaw-a-deadly-serious-investigation/
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I never did like that little shit.

He couldn't kill a couple of fucking burglars with deadly traps as a child. You expect him to change that much?

This.

He could easily have killed either of them with some of the traps he set and failed time and again.