While many, such as "On Killing"'s author LTC (Ret) Dave Grossman (of the Sheep, Wolves and Sheepdog analogy fame), have sought to make a definite link between these "murder simulators/trainers" as they are often portrayed, I think that you also need to take a look at what else was going on in the head of this young, disturbed man. Of the folks you know that play games such as Call of Duty and the like, how many also fantasize about topping Norwegian killer Adners Breivik "score" of 77 murders in 2011? How many have disfunctional home lives - okay, probably a lot in this day and age. My point is this though, while playing games such as COD may indeed trigger some thought processes towards violence, it does not directly lead to murder as some would have you think. If that is the case nobody would be safe as at any time there are over a half million people or more around the world online playing these games.
Here is something to think about as well, video games have had a rating system and supposed "regulations" against people getting them younger than they are supposed to be for the game for years now...thanks Tipper. But yet, despite this, Lanza, who was 20 and able to purchase any game he pleased, still was able to do this horrible crime. Do we still think that regulation is the best way to prevent crime if only the "good" people intend to obey laws written for criminals.
I wonder if we will see a violent game ban coming, probably not as a large demographic for one of our two major political parties includes young gamers that they rely on for voting. I wonder what it would be like if all of a sudden games were scarce and going for double or triple their normal price? Video game horders?
Anyway, speaking of violent video games, here's a chance to watch Adolph Hitler being offed in various ways via a "kill cam" in the WW2 themed shooter Sniper Elite v2.....yeah, its pretty violent....