"What we really need is a cultural change towards acceptance of violence of all sorts in our society, be it the public brawl on the high street on a Friday night, or the more insidious violence that happens behind closed doors, and this is an area where predictive policing could really help."
I doubt it'll work. Violence is damn near instinctive, probably even biological. That's why it feels so damn GOOD to vent steam, to shoot guns at nothing in particular, to unload on a punching bag, and so on. I would say getting rid of violence is going to be a tall order when our bodies are against us in that regard.