This is not a cri de coeur for the failed and failing. Nor is it a lament for the impoverished. Mob violence, despicable and inexcusable, must always be condemned. But those terrorising and trashing London are also a symptom of a wider malaise. In uneasy societies, people power – whether offered or stolen – can be toxic. Most of the 53 per cent of e‑democrats calling to have the death penalty reinstated (of whom 8 per cent would opt for firing squad or gas chamber) would never dream of torching a police car, but their impulses hardly cohere either with David Cameron’s utopian ambitions.