There are horrible fanatics in every society, ready to kill. And there are people who pick up on the militarised values of societies and become convinced that it's heroic to kill, and that it's the only way to free people from a dictatorship or an invasion.

A personal note: I was on a plane from Paris the day after Manchester, and my boarding gate was next to the gate for a plane to Saudi Arabia. The people taking that plane were the most pale, silent and subdued group I've ever seen board a plane. One girl in jilbab and hijab was white in the face and almost fainted on her way out the boarding gate. A plump, middle-aged woman in a flowered scarf who reminded me of everyone's gran in 1950s Ireland sat hunched with her head bowed.

Manchester was an atrocity. Someone so full of hate that his favoured target is a concert for thousands of little girls has lost all reason. But not all Muslims are bombers.