An 8-year-old boy goes outside for shopping. On the way, he tragically slips and drowns in a pool of rainwater, where he is found dead the following day. Some observers accuse Jews — without any evidence — of having murdered the boy. Leaders echo the charge, and locals march toward a nearby Jewish neighborhood seeking “vengeance.” ... The rumors of kidnap and murder spread on social media. A Twitter account named “Real Seif Bitar” tweeted that Abu Ramila was “kidnapped and executed” by a “herd of violent Israeli settlers,” who assaulted him and threw his body in a well. Palestinian...