Do video games (perhaps violent ones) teach children to be violent?

I have often heard certain politicians (can't remember who) claiming that video games cause children or adults to engage in violent activities.

Do games like Grand Theft Auto convince children that extreme violence, drugs and stealing cars is okay? do Video games (specific or in general) cause any negative affects on the public?

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I don't think video games can cause children (or adults) to be violent. Besides, if this were to be true why stop at video games. Violent movies, TV shows, heck even cartoons should be treated with the same vindication. And we all know that's not going to happen.