1. A photo showed a policeman clearing a path through the crowd as the mob hauled the body behind him.
  2. Reflecting on the French Revolution a century earlier, thinkers such as Gustave Le Bon helped promote the idea that a crowd is always on the verge of becoming a mob.
  3. Fearful of armed crowds and the possibility of mob rule, the American constitution had been explicitly designed to empower not ordinary citizens, but a “natural aristocracy”.