I think the most important underlying point here is that youth violence has steadily declined as the popularity of videogames has gone up. If you want to make the argument that they are causing a problem of youth violence, you must first establish that there is a problem at all.
I understand the knee jerk reaction to the idea of kids seeing some movies or games or a lot of stuff on the internet, and I think it's good parenting to keep kids away from that stuff until they're old enough to handle it (varies from individual to individual) but seeing a disturbing dramatic scene is not going to cause real damage to anyone.
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