Mark Stein says violence without context is Hollywood's bread and butter now. People don't get shot because they're Nazis or "Japs." He describes Quentin Tarantino as the "Mantovani of violence," making violence into an easy listening Muzak. Tarantino writes violent films about nothing.
And when you have violent films about nothing, and then suddenly you start having violent school shootings about nothing, where people are prepared to kill people not for any cause or anything, but as an act of theater, then I think that is worth pondering, and he should be defensive about it.
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