Does tv/game violence have any real life effect?

I find it curious that the general consensus of the industries is that watching this stuff has no or little effect, yet their main income is from proving that watching it does indeed have a profound effect, and that a whole industry has grown up around this premise. Still thats just advertising, and we've all... show more I find it curious that the general consensus of the industries is that watching this stuff has no or little effect, yet their main income is from proving that watching it does indeed have a profound effect, and that a whole industry has grown up around this premise.
Still thats just advertising, and we've all learned to tune that out, the other is stuff you're truly immersed in, that wouldn't make a difference, surely.
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