Writing at The American Conservative, Philip Jenkins points to a surprising demographic trend in Turkey:
Overall, Turkey’s fertility rate is a little below replacement, but that simple fact obscures enormous regional variations. The country can be divided into four zones, stretching from west to east. The Western quarter is thoroughly European in demographic terms, with stunningly low sub-Danish fertility rates of around 1.5. The rates rise steadily as we turn east, until the upland east has very high rates resembling those of neighboring Iraq or Syria. “Europe” and the Third World thus jostle each other within one nation.
High-fertility eastern Turkey is of course much more religious than the secular west, and this is where we find the Qur’an Belt that so regularly supports Islamic and even fundamentalist causes. It simply makes electoral sense for the government to respond to the interests of that populous growing area, and to drift ever more steadily in Islamist directions.
But there is a complicating fact. Those fast-breeding eastern regions are also home to what the Turkish government euphemistically calls the “Mountain Turks,” but which everyone else on the planet calls “Kurds.” Turkey’s Kurdish minority, usually estimated at around 15-20 percent of the population, is expanding very rapidly—to the point that, within a generation or two, it will actually be a majority within the Turkish state. This nightmare prospect is front and center in the mind of Turkish president Recep Tayyip Erdogan, who a couple of years ago issued an apocalyptic warning of a national Kurdish majority no later than 2038. That date is a little implausibly soon, but the principle stands.
Thus we can understand why the Turkish government is far more eager to strike Kurdish fighters than ISIS: “ISIS is an irritant; the Kurds pose an existential demographic threat.”