Rabia Chaudry kept her 7-year-old daughter home from her private Islamic school in Maryland on Thursday, fearing anti-Muslim backlash from Wednesday’s massacre nearly 3,000 miles away in San Bernardino, Calif. “I think we are all feeling exhausted and very vulnerable,†said Chaudry, a lawyer and national security fellow at the New America Foundation. “I’m angry at those people who did this attack. And I’m angry at how this is being politicized. Everything boils down to, ‘We should fear Muslims. And they shouldn’t be here.’ †American Muslims say they are living through an intensely painful moment and feel growing anti-Muslim...