one does not need stats to know that when you play a videogame, you influence what is happening within the game. Otherwise, it would be called watching, not playing.
on the subject of evidence, there is a lot of stuff on Grossman’s website: http://www.killology.com
Then what good is a thesis with no evidence to back it?
An F in any college I know of.
BTW, he has none of the evidence as there IS no evidence.
Produce any proof at all. You or he will be the first in history.
Otherwise, a hypothosis without test and evidence is just so much flatulance, regardless of how much sense it makes to you.
I can show you proof that murders in general in the US are falling, and sales of video games are up.