umm, what the hell. This is the kind of article I'd expect from a scare scaremongering, technophobic, tabloid.
The guy tried to kill someone because he's mentally deficient or unbalanced in some way. Playing a game has nothing to do with it, it would have been some other reason if not this, some other reason that no other normal rational person would consider grounds to go and find someone and thrust a piece of sharp metal in to them.