If the Arab Spring uprisings were an earthquake in Middle Eastern politics, last week was a major aftershock. The rumbling began in Cairo, where a satellite TV station run by Salafis played clips of an inflammatory film about the Prophet Muhammad. Soon after, Salafi religious leaders called for protests at the U.S. embassy in Cairo, blaming Washington for not censoring a film made in the United States. The pattern was repeated in Libya, Tunisia, Yemen, and elsewhere. Although much has been made of the riots as a response to the film, they are more fundamentally about the nature of the post-Arab Spring regimes, and specifically about who gets to police public morality. Salafis across the region see themselves as the rightful guardians of the public sphere -- and are acting to ensure that others see them that way, too.