Well, since you're going to rely on studies... (Damn, I don't have time for ths, but still I'll have a go at trying to stay coherent)
There are certain, well established facts that do point in the direction that violent behavior is based on mimicry (e.g. the bobo doll experiments). Most Studies concerning video game violence are correlational designs which don't give evidence for causal effects (thats not entirely true, if you have enough data an use path models or cross-legged designs but I won't go there now since I'm not really the expert on that matter^^). Another Issue is the operationalization of "violence" and "video game violence", or in normalspeak: how these things are measured. In some studies you might find that "video game violence" means Doom 3, in another it's Tetris (ok, a wee bit exaggerated but you get the draft). Apart from these Problems there seems to be no easy "A explains B" solution to the data that's gathered until now. Both might be the case with a slight tendency to "video games -> violence" in the last years, but well... it certainly is an argument that the news show more violence than the average game. Its a complex matter thats broken down to sizeable bits for headlines and 2-minute-newscasts. I guess parental responsibility would indeed be a larger factor in explaining the childs aggressiveness (In adults the causes should lie elsewhere anyhow).
Just my two cents. Cheers!
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