While there remains a great deal of disagreement among experts about the relationship between media violence, in particular video game violence, and increases aggression. One expert in the field, Chris Ferguson, suggests than there is no basis for a causal relationship, and that the motivation for using such media is more telling than the media used.
http://www.christopherjferguson.com/CJBGames.pdf
http://ideas.time.com/2011/12/07/video-games-dont-make-kids-violent/
http://www.huffingtonpost.com/christopher-j-ferguson/media-violence_b_4018469.html
http://www.tamiu.edu/newsinfo/3-27-08/article13.shtml
