When I think about the phrase "violent culture," I don't think about video games, books, music, and movies. I think about the real life society that made it possible for military invasions and occupations of other countries - at the cost of hundreds of thousands of lives - possible.
26 foreign kids being blown up in a Cambodian, Vietnamese, Serbian, Iraqi, Afghan, (etc., etc.) village? Perfectly normal. We've been taught from a very early time that's just military business. This is how we get away with mass-murdering all kinds of people all the time. In other words, [real] human life is trivialised all the time here in the U.S.