Are there many studies on the effects of violent movies, violent TV, violent music (it exist), violent books, comics, news, sports such as boxing and football? The answer is simply NO there is not.
Video games are getting the short end of the stick compared to other media nowadays , most likely a result of it being the youngest.
All i know is that at my school the people who played football were far more violent then the people who played GTA.
This is the Game of Thrones
Where you either win
or you DIE