Who is focusing on that?
Mostly nanny-statists who are concerned about how violent video games are.
On the other hand, youth violence trends downward as better game consoles are released, and studies have found no to negative correlations between playing 'video games', 'violent video games' and real world violence...
It's a bit off topic, but I remember one 'study' that looked at violent cartoons resulting in increased violence in young children. Then you read into the study and find that they counted live-action shows like Power Rangers as 'cartoons', that it required no parental supervision and only caused short-term violence as kids acted out what they saw on the TV - and it only really happened with the live-action stuff. Warner Brother's cartoons had little effect.