Finally, I’d say Huntington misunderstood the nature of historical change. In his book, he describes transformations that move along linear, projectable trajectories. But that’s not how things work in times of tumult. Instead, one person moves a step. Then the next person moves a step. Pretty soon, millions are caught up in a contagion, activating passions they had but dimly perceived just weeks before. They get swept up in momentums that have no central authority and that, nonetheless, exercise a sweeping influence on those caught up in their tides.