ZZoMBiE13 said:
I can give you a clear benefit of violent video games. They provide a cathartic stress relief in a constructive way rather than a destructive one.
Actually, in regards to rage and violence, catharsis does not work: http://youarenotsosmart.com/2010/08/11/catharsis/
The so-called cathartic relief of acting out violently is just some temporary satisfaction, that does nothing to reduce violent tendencies. The belief in catharsis is proven to make people want to seek it out, however. For what that's worth.
However, the one thing violent video games definitely do accomplish is distracting violent people. It occupies them so that they're not acting out violently. It's the same reason why after-school programs are the most effective means of curbing petty crimes, it keeps kids out of trouble (and kids are a high crime group).
I recall a study from many years ago that showed during the premier of violent movies, crime tended to drop in these particularly violent neighborhoods. The violent crime rate only dropped for the period the movies were playing, however, and then went right back to normal thereafter. The explanation? Violent people consumed the violent media, but then went right back to being violent with no change in disposition.