You are absolutely right. And I was just kidding.
It just isn't right to blame everything on video games. I always die a little inside when I see Thompson make such comments...
As do I

We have rights too! We should not be discriminated against like some tragic minority group!
But sadly many people still hold by the stereotypical views on gamers, which, for some, seem to include tendency toward aggression, whereas I know NO one in my gamer friends who is even prone to be aggressive...
In that respect, I have written an
exposé rant on that before, I'd like to point out that me, and many people like me, really enjoy violent games (FPS, TPS, GTA,...), yet I am one of the most pacifist people out there...
When you are a sane person (relatively speaking *cough*), you can make the distinction between "real" world and "Imaginary" world/the world of Dreams, Fiction, Movies, Games,...
When you are not a sane person, or at least likely to your sanity - even if that be only at certain [physically or usually definitely psychologically provoked] moments, in which ANY exposure of violence coming from either the "real" world or the world of fiction can be used as inspiration to commit some sort of felony.
BUT, and this is a big but (haha, stop laughing), people do NOT need to have seen or actively played videogames to know about evil. Nor do they have to have seen violent action movies. Everyone is capable of "snapping", and everyone is able to kill someone. Though you could enforce/kindle certain action patterns, you cannot create them solely on the basis of one's experiences, which coincidentally are - statistically proven - MUCH more real-world based than fiction-based, and if not, the kinds of fictionalised violence that could really have an impact is, also, one's own dreams/phantasies, with which we have gone full circle and have ended up back at the psychological background of someone who snapped or is likely to.
Thus ends my rant.