Computer games don't make people turn to crime, the newspapers have got it bass ackwards.
When someone causes a heinous crime the papers often blame the music they listen to, the movies they watched or the computer games they played.
They've got it backwards. Those things don't turn someone into a violent person, violent people are more likely to favour those things as opposed to calmer music/movies/games. I'm not saying that all people who like those things are violent - most people have stable personalities and know the difference between those things and real life, but a violent killer is more likely to favour a violent game than Barbie Pet Rescue or whatever.