When the American Islamic Forum for Democracy organized “A Rally against Terror” on April 25 in Phoenix, its head, an Arizona physician named Zuhdi Jasser, said his goal was to give Muslim moderates “an opportunity to speak out publicly.” And Jasser presented the rally as a robust response to the many criticisms that American Muslims had not produced a “groundswell of condemnation” against terrorism. In fact, he asserted, The killing of innocent people out of revenge, out of hate or out of retribution is against the absolute laws of Islam. Suicide is against the absolute laws of Islam. People...