On 9/11, the global jihadist movement burst into the world’s consciousness, but a decade later, thanks in part to the Arab Spring and the killing of Osama bin Laden, it is in crisis. With Western-backed dictators falling, al Qaeda might seem closer than ever to its goal of building Islamic states. But the revolutions have empowered the group’s chief rivals instead: Islamist parliamentarians, who are willing to use ballots, not bombs.