I was a little concerned when I read in a recent post on Mashable that Joe Biden has been asked not to investigate any linkage between violent video games and recent school shootings – http://mashable.com/2013/01/08/biden-video-games/
While we are never going to be able to definitely prove that exposure or addiction to violent video games is responsible for these tragedies, it is critical that this potential contributing factor is investigated and considered in addressing the events that have seen so many lives wasted.
There are a number of reputable studies that indicate there is a relationship between exposure to violent video games and altuism. People exposed to violent video games physiologically and mentally react with a reduced level of responce when exposed to violent behaviour. http://lol.medieraadet.dk/upload/mulige_aasager_social_hensynsloeshed.pdf The people become desensitized and this behaviour becomes more the expected norm.
I suspect that the games industry is protecting itself and its abundant revenue stream derived from these graphic and captivating games.