Do violent games lead to violent behaviour

yes, mostly children above +15 are mature enough to see that it is stupid to hurt some one ells

Not necessarily. They can provide an outlet for people to make them less violent. There are some very passive people out there who play very violent games. Sometimes it's people who don't play the games, or who don't really understand them that make sweeping statements, trying to pin the blame on computer games.

Studies have shown that the correlation is more that violent people will prefer violent games, rather than the games making the players violent.