When is violence justified as a response to manifest and apparently immovable injustice? My answer, with Martin Luther King is: Never, or almost never.
In large measure, my reasoning is consequentialist. Violence directed against established authority rarely works, and hardly ever produces enduring gains. Most revolutions fail, and most successful revolutions produce a new tyranny, often worse than the old, followed eventually by a return to the status quo ante.
Symbolic violence is almost invariably ineffectual or counterproductive, precisely because it derives whatever force it has from the implicit or explicit threat of revolution, which most people rightly view with fear and horror. Since symbolic violence the only kind of violence that is likely to arise in the context of the current #OWS protests, it’s important that it should be avoided as far as possible, and condemned, without qualification or excuse by reference to police violence, when it does occur.