As someone who plays a
lot of violent games, I've got a bit to add. It is stress relieving, it is entertaining, when done well it can evoke emotions (Halo 2 and Half life 2 were particularly good at making you feel like a hero who was looked up to by people). But to say that by playing a game your going to go insane and froth at the mouth is just BS. Watching a movie will have the exact same effect - Troy, for example, reminded me of playing Halo 2. Because of the emotions it made flare up.
Many things will anger you. Playing a game will, generally, relieve that anger (unless it's a MMORPG and your dealing with idiotic teammates >_>). It's just the same principle as someone who gets a punching bag and exercises on it when they have a bad day at work. Some people have got it into their minds that running over someone on a TV screen is the worst thing a person can do.
These people are the same kind as those who opposed Rock Music back in the 60's. Who opposed blacks getting the vote. Who now oppose homosexuals getting treated like the decent human beings they are and getting fair and equal treatment. They get so caught up in their narrow, petty mindset of 'our values', they refuse to believe that just because they don't understand or enjoy something doesn't make it automatically evil. Those kind of people evoke more anger in me than any number of games or films or songs will do.
And now, a smiley.
