London—Trying to return to Hackney, five minutes from the heart of the protests, from vacation on the night the rioting was at its fiercest provided an insight into the carnage engulfing London. The city had been transformed into a kind of Alan Moore dystopia. Sirens were deafening, with bright lights blinding. Train operators announced gravely that there had been “civil unrest” across London, and that some areas of the city were no longer safe.