I was just thinking Tarantino reading this before you mentioned it, but from a completely different angle. In the Mr Blonde scene in Reservoir Dogs, for example, almost everything is to do with what you don't see rather than what's on screen. I wouldn't say that art normalises violence. Ok some art normalises violence, but more often than not it's because the violence is gratuitous. The point is that it's not the portrayal of violence itself which leads to normalisation so much as the manner in which it's portrayed. Done well, violence is unpleasant; something to be avoided.