Again, I do not see a cause and effect connection between a person who snaps and video games.
Let’s see, he spent his time watching video games in which he was shooting up masses of people with high-powered weaponry. Then he goes out and does the same thing in real life. I think it’s much more unrealistic to insist there’s no connection, than to suggest there might be one.
And do you know what movies he watched? Violent TV shows? What other possible stimuli could have affected his perception of reality?
There are a lot of possible factors, yet to cherry pick video games as the “obvious” culprit is absurd, IMO.