Back in the 80's there were football hooligans slashing each other up at every match, they made films about it, a lot of films, and people wonder where the kids get it from. And like it's already been said, brought up on violent games, currently on Black Ops 4 you can set fire to women and evey one else in the game, and listen to their screams, just what you want your 5 year old's growing up with, there are also stabbing quests, which there seems to be a lot of lately.
Like it's been said, if you don't bring your kids up, they will drag them selves up, and we all know what happens then.