Intolerance is not just part of al-Qaeda, it is part of Islam Non-Muslims are barred from entering the cities of Mecca and Medina — not merely barred from building synagogues or churches, but barred, period, because their infidel feet are deemed unfit to touch the ground. This is not an al-Qaeda principle. Nor is it an “Islamist” principle. It is Islam, pure and simple. “Truly the pagans are unclean,” instructs the Koran’s Sura 9:28, “so let them not . . . approach the Sacred Mosque.” This injunction — and there are plenty of similar ones in Islam’s scriptures — is...