According to The American Academy of Child and Adolescent Psychiatry wrote in an Aug. 2006 article "Children and Video Games: Playing with Violence" published in their Facts for Families information sheet series stated:

A research about children who open themselves to violence video game are happen to feel invulnerable or insensitive and they are most likely try to follow the aggressive as to them it is a sign of being cool, strong and some of them see violence as a solution to problems.

Moreover, spending a lot of time playing these games can make children obsessing and leads to problems such as weak communication skill, more aggressive attitude, paying less attention to homework or other outdoor activities which also a cause of young people obesity.


http://www.aacap.org/cs/root/facts_for_families/children_and_video_games_playing_with_violence