So... it's interesting that the narrator said "something inside him snapped" after he'd already showed instability on dozens of occasions. Also interesting that he attributed his lack of family to an act of god. It couldn't have been that people realized he was insane. No. God wanted him single so he could do his work.
At the same time, I am seeing links between this and the post I made the other day about the guy who attributed his life being saved to god looking out for him.
And, I kind of want to build a killdozer now. Not to go on a rampage, but for the zombie apocalypse.