Alright, so all the killers played games.
So what? Just about every male in the 18-30 age group does.
These people played violent games.>They massacred people>Games lead to murder
Is the same fallacy as Britain Banned Guns>Gun Crime went down>Crime is lower.
It's a selection bias, and not a useful metric. Can you show me source material that says otherwise, or just Dr. Grossman's opinion on the matter?