I am listening to Tony Blair talk about the Israeli-Palestinian conflict on the BBC World Service. He is saying that the central thing of importance is that "the violence must end." I am not sure what I think about this idea, either in the specific case, or the general case. For example, cases of linguistic violence, rampaging trolls, and similar. It would be good if violence could end, but it won't end until the sources of violence are cut-off. But is this is even possible?