Andrew Sullivan links to a video recently shot outside of Cairo, depicting a berserk Sunni mob savaging a group of Shiites who were praying in the Shia way inside a private residence. The mob murdered four of the Shia. Sully says that unlike Europe, we Americans never really experienced violent religious fanaticism, so we underestimate the power of these ideas in the minds of others. He writes:

You can look at the barbarism and violence and ardent murderousness in this scuffle and see the imperative to stop it, or look at it and see the impossibility of intervening from the outside. I fear the Muslim world may have to go through much more of this before it gets past it. The wise foreigner stays out.