""Especially if you can buy them over the counter, like a bag of twinkies. This kid may not be a nutter. He may be normal, and snapped.""

Highly unlikely, given the number and variety of booby traps he built and armed, and the body armour, helmet etc.

He also bought the guns recently for precisely this event.

He is at the very least obsessive, at worst completely mad, but I'm inclined to believe he is a murderous sociopath, who is only too aware of the difference between right and wrong but doesn't see that they apply to him.

He'll have a job to convince a jury that he didn't know what he was doing, given the meticulous planning involved.

Don T.