I do not think we have to fully choose between these alternatives. Radical movements are often multivalent, with ideologically motivated sadists and strategically minded gamblers converging on the same plan despite somewhat different self-understandings. But there is another way of thinking about extreme violence as a strategy, one with wider implications than just its potential effects on Israeli policy and Saudi-Israeli rapprochement. Yes, a movement deliberately going to extremes risks the Islamic State scenario, where you isolate yourself so completely that you end up first morally delegitimised and then cornered and destroyed. Clearly, that’s the risk Hamas is running now....