Saying that there are chemicals in our food that increases our violent impulses makes more sense than saying television leads to violence. Television just makes people lazy. Questioning morals and previously held beliefs is what has made some people more violent. They've questioned it to the part where they no longer care.
No. Television programming tends to follow what is happening in society instead of the other way around.
No. Violent people are the leading cause of violence in our society. A gun by itself is an inanimate object, a knife is just a piece of steel, but they both become tools of mayhem when wielded by people intent on destruction.
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