Whenever I write about Europe and demography, I get a lot of mail on the general line of “Oh yeah, Steyn? When will Muslims be 50.01 percent of the population then? 2020? 2030? C’mon, you scaremonger . . .”

And I usually reply that it’s not about hitting 50 percent. It’s about the point at which mediating between the Muslim population and the broader population becomes a central and then the dominant feature of the culture. In Northern Ireland, the Loyalists outnumbered the Republicans by two to one more or less, but an arithmetical majority didn’t prevent 30 years of, to …