You better hope to hell that video games does not effect behavior. I hate to break it to you however most of the kids and teenagers are glued to Playstation where they kill shit the entire time. Even the most child like games involve killing. Even Mindcraft involves killing!
I let my son play all the games in hopes of taking the mystery out of GTA and COD. IT's hard as a parent becasue with PS4 they can also connect around the world and have friends all over the planet and learn different cultures and hopefully be less willing to fight other people when the governments decided to kill off a bunch of us in a war. Probably wishful thinking but we have got to get out from under the governments control of us.
If somehow they are programming our kids with these games we are all in deep shit as there will be 7 billion killing machines that have no remorse for killing. Yikes.