Actually there are kids who kill people because of games.
This is not true.
There is no serious scientific proof that.
Some organisations claim that though.
All games with mature content are labeled with parental advisory and must not be played by minors.
Parents have the liability of their children and must ensure that they don't have access to such media. If they don't they are ones that must be blamed.
Also it should be forbidden to own or use a weapon for not absolutely reliable people. It is way to easy to get lethal weapons in many countries, which I condemn.
Sadly there are some software companies who also publish very brutal and immoderate games, in which you often have to torture other humans or animals.
Computer games are made to entertain, those games do not entertain and should be banned.