The first rule of Islamic fight club is that non-Muslims aren’t allowed to talk about it. And if it must be talked about, it has to be treated as a local phenomenon. That means insisting that Hamas is attacking Israel for political reasons, the Houthis are shooting at ships for political reasons, the Fulani are massacring Christians in Nigeria for political reasons, the Pakistanis, the Taliban, the Iranians, the Syrians, the Iraqis, ISIS and Mohammed who decided to stab someone on a train are all doing it for completely unrelated reasons. On the other side, devout Islamic leaders focus on...