I googled 'video games harmful' because I am not baised and guess what the LATEST research says?..... Go on ...... Guess..... A little...
http://www.springer.com/about+springer/media/springer+select?SGWID=0-11001-6-1433942-0
Video games do not make vulnerable teens more violent
Study finds no evidence that violent video games increase antisocial behavior in youths with pre-existing psychological conditions
Do violent video games such as ‘Mortal Kombat,’ ‘Halo’ and ‘Grand Theft Auto’ trigger teenagers with symptoms of depression or attention deficit disorder to become aggressive bullies or delinquents? No, according to Christopher Ferguson of Stetson University and independent researcher Cheryl Olson from the US in a study published in Springer’s Journal of Youth and Adolescence. On the contrary, the researchers found that the playing of such games actually had a very slight calming effect on youths with attention deficit symptoms and helped to reduce their aggressive and bullying behavior.