Conversely, most other western citizens believe that, to invert Trotsky, if you’re not interested in Islam, Islam won’t be interested in you. Ariana Grande was eight at the time of 9/11, and most of her fans even younger. They have passed their entire sentient lives in the age of Islamic terror, yet somehow assume it’s something compartmentalized and sealed off from them. “Dangerous Woman” is meant to be an attitude, nothing more – an edgy pose in a pop culture that lost any edge long ago; a great T-shirt, like the ones last night scavenged from the merchandising stands and used to bandage the wounded. It must come as a shock to realize there are those who take your ersatz provocations as the real thing, and are genuinely provoked by them.

“Carrying on exactly as before”, as The Independent advises, will not be possible. A few months ago, I was in Toulouse, where Jewish life has vanished from public visibility and is conducted only behind the prison-like walls of a fortress schoolhouse and a centralized synagogue that requires 24/7 protection by French soldiers; I went to Amsterdam, which is markedly less gay than it used to be; I walked through Molenbeek after dark, where unaccompanied women dare not go. You can carry on, you can stagger on, but life is not exactly as it was before. Inch by inch, it’s smaller and more constrained.
And so it will prove for cafe life, and shopping malls, and pop concerts. Maybe Ariana Grande will be back in the UK – or maybe she will decide that discretion is the better part of a Dangerous Woman’s valor. But there will be fewer young girls in the audience – because no mum or dad wants to live for the rest of their lives with the great gaping hole in your heart opening up for dozens of English parents this grim morning. And one day the jihad will get lucky and the bomb will take with it one of these filthy infidel “shameless” pop whores cavorting on stage in her underwear. You can carry on exactly as before, but in a decade or two, just as there are fewer gay bars in Amsterdam and no more Jewish shops on the Chaussée de Gand, there will be less music in the air in western cities. Even the buskers, like the one in Manchester’s Piccadilly Gardens today serenading a shattered city with “All You Need Is Love”, will have moved on, having learned that it’s a bit more complicated than that.