Imagine a world in which a young man is locked in a cage, has petrol showered over him and is set alight to be burnt alive. Imagine the triumphant jeering of an audience that has gathered to witness this. Imagine, also, a 12-year-old child with elated determination on his features shooting at close range a kneeling man with his arms tied behind his back. Then picture the spectacle of a hundred beheadings of victim after victim in humiliating uniforms, their hands and feet bound, kneeling with their backs to their black-robed executioners who wield knives to cut their throats as...