Western elites believe that universal values are trumping the forces of reaction. They wax eloquent about the triumph of human rights, women's liberation, social media, financial markets, international and regional organizations and all the other forces that are breaking down boundaries separating humanity.

Take Cairo's Tahrir Square in early 2011. Western journalists celebrated the gathering of relatively upper-income Arab liberals with whom they felt much in common, only to see these activists quickly retreat as post-autocratic Egypt became for many months a struggle among the military, the Muslim Brotherhood and the Islamist Salafists—with the Coptic Christians fearing for their communal survival.

Egypt and the Middle East now offer a panorama of sectarianism and religious and ethnic divides. Freedom, at least in its initial stages, unleashes not only individual identity but, more crucially, the freedom to identify with a blood-based solidarity group. Beyond that group, feelings of love and humanity do not apply. That is a signal lesson of the Arab Spring.