Since humans have long been violent before TV and video games, I don't think they contribute.
The threads says "Does violence in video games
contribute to real life violence," and not
cause.....(Like adding fuel to fire.)
I agree that humans[mostly referring to Males(nothing personal, I am a male too.)] have significant history for being violent.
I comply with other posts and think Violence in games does indeed, directly or indirectly causes one to think violently. Even if its not visible to others. Nevertheless, there are excemptions to what I said above.
Also, I don't want to say, that one should stop playing violent games for good. Just keep in mind the difference between a game and the reality.
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The human mind is a complicated "thing," which can't be understood this easily........