I was raised in a Catholic family and still violent video games, horror movies, etc. were a strict no-no. Most of the kids in our vicinity were addicted to violent video games and some of these kids started to identify themselves with violent characters and used profanities. All of this blew out my parents minds and nothing of this sort ever came to our home. But our house was never void of entertainment and hence we never felt that we were missing something,
All of those kids are grown up and good people now.
As far as I’m aware, there are inconclusive studies in this matter. Not all violent video game players become aggressive and short tempered individuals, the way not all smokers get lung cancer. The entertainment industry is probably reluctant to admit that they are marketing a harmful product, much like the tobacco industry was reluctant to admit that they were marketing a harmful product.
However, in my house and in the future for my kids too, I would prefer not to expose them to violent video games or smoking.