John Carmack is currently working on RAGE, a game that, from what we've seen, will feature a fair amount of violence. His resume, which includes legendary games like Doom and Quake, hasn't exactly been short of violence either - so when he speaks up about the impact of said violence, it's probably worth listening. Especially in the wake of the Oslo shootings.
"People just play games now and I never took seriously the violence in video games debate," said Carmack, speaking to Industry Gamers. "It was basically talking points for people to get on CNN and espouse their stuff on there."
Carmack also pointed to new research that linked the rise of video games to reductions in crime.
"I really think, if anything, there is more evidence to show that the violent games reduce aggression and violence," he claimed. "There have actually been some studies about that, that it’s cathartic... I think it’s at worst neutral and potentially positive."
Doom Creator: Games Are Cathartic, Reduce Aggression and Violence [Industry Gamers]