Yesterday, a friend sent me a link to an article entitled “Eurabian Follies” on the website of the journal Foreign Policy. The author, Justin Vaïsse, took to task several authors, including me, who have warned in recent years of the Islamization of Europe. Vaïsse countered these authors’ mountains of hard facts with a big helping of the usual supercilious sneering. His thesis: Europe is chugging along just fine; Islam poses no real challenge to the continent’s freedom and prosperity; after all, the “experts” say so. Never mind the draining of European welfare systems by Muslim families, the explosion in rapes and...