They also report that neither the teens nor their parents noticed any increase of aggressive behavior that could be tied to violent video games.
Adolescents who play violent video games may become increasingly aggressive over time, a new study of Japanese and U.S. teens suggests. The study is among the first to chart changes in gamers’ aggressive behavior over time, lending weight to evidence that violent video games can.
Does exposure to violent movies or video games make kids more aggressive? . I don't deny that there are many, many adults and teens out there who play.