According to accepted psychological research ... it does. Well, not murderous, as that sort of research would never get approved.

But aggressive ? Certainly.

Why can't people accept this ? It's the very idiotically basis of how the human mind works: it learns. 99.99% of the time it learns by imitating something else. Give it something violent to imitate (no matter how artificial, fake, drawn, ...), and ... surprise ! It will come up with more violent answers in the future. How is this strange or unexpected in the least ?

And yes, I get it, you feel like you are in control of your own mind. By the way, how do you explain how advertising works if that were true ? Or the obvious influence mass media have ? Or why absurdly large groups of people keep coming to the same conclusion (from culture, to political "winds", to google searches ... all shows strong correlations between huge groups of people).

Now granted, this is results like 10% more likely to use minor violence in a "get something taken from me" situation among children (the other alternative generally being getting adult help, which may or may not cooperate depending on the study). None of those studies are saying Rambo turns toddlers into terminators. But objectively, measurably more violent ? Yes, yes it does. It does so heavily in the short term (hours), then the effect slowly dies down (but it's still significant 20 years after the exposure).

This has been incredibly thoroughly tested and yes, we are VERY sure this does in fact happen.

I think both are in the same category. Being horny is like being violent. If you don't have access to a partner or a weapon then your just an angry dude in a dark room fapping into the abyss.