The Radical Disease: Europeans increasingly speak of Islamic extremism as if it were an illness.

No one in Europe has the faintest idea how to react—at least within the bounds of decency—to the alarming propensity of young Muslim citizens to become partisans of violence and terrorism. There is a tendency to think of “radicalization” as a kind of disease, one that will appear in the next edition of the Diagnostic and Statistical Manual of the American Psychiatric Association, thus offering the hope of some technical procedure—pills, perhaps, or psychosurgery?—that will cure it.