I disagree with arguments that video games make kids violent. I think the violence is already there and the games are an outlet which may help you express certain desires but don't cause them.
I think the effect is more a matter of TV (& Internet video) than other forms of media. There seems to be something almost subliminal about the way TV taps into your brain. Radio is easier to filter out. Newspapers, the Internet (text), and Twitter all go through a more conscious thinking portion of your mind.
That said, the whole point of media is to effect behavior. If a Newspaper couldn't inform your decisions - and by definition alter your thinking & behavior - then what is the point in reading it?