You have to hand it to Islamic State. It’s not only good at capturing towns and cities, cutting off the heads of its enemies on camera, selling off 14-year-old girls into sexual slavery, carrying out mass executions with the efficiency and enthusiasm of the Reich’s SS Panzer Division and cutting videos to music; it has also managed to persuade us that it can’t be beaten.
“Seemingly unstoppable,” as someone on the BBC’s Today programme described the Islamist group the other day. “The Isil steamroller,” an American news anchor echoed. “There’s nothing to hold them back,” agreed an exhausted Kurd who had just escaped the street fighting in Kobane, on the border between Syria and Turkey, and was interviewed by the massed ranks of the world’s press.