Most games are violent, from CoD to space invaders to manhunt to Mario (you jump on things head, for jebus sake) to fight night, maybe even football/NFL/ rugby games are violent, your killing things which is inherently violent.
Maybe it is more graphic than it used to be but were still doing the same thing, killing
After many generations of games were still not going out killing people en masse.
If we took after video games then in the 80s they would walk around in dark rooms, listening to techno music and munching pills ... wait ...