I believe Brendan O'Connor made a good point in this article [http://www.escapistmagazine.com/news/view/111895-Oslo-Murders-Lead-to-Calls-For-Game-Bans-in-Australia]:
Videogames may have had a slight part in Breivik's acts, but we should probably also remember the other factors in his motivation, partly the one about him being absolutely demented.
I accept some insane people might end up being pushed over the edge by videogames, but the answer to that is simple; don't let them get to the videogames in the first place. What we shouldn't do to achieve this is outright take them off the shelves.
Videogames may have had a slight part in Breivik's acts, but we should probably also remember the other factors in his motivation, partly the one about him being absolutely demented.
I accept some insane people might end up being pushed over the edge by videogames, but the answer to that is simple; don't let them get to the videogames in the first place. What we shouldn't do to achieve this is outright take them off the shelves.