“Bashar Abdo had just returned home last month after four years in the Syrian military when a mob of neighbors and others armed with guns and knives swarmed his family’s front door and accused him of being a thug for the ousted regime. His sisters and sister-in-law tried to block the crowd as he hid. But people stormed in and found Mr. Abdo, 22, in the kitchen. They stabbed him before dragging him outside, even as his sister, Marwa, clung to him. There, he was shot. The account, shared by Mr. Abdo’s family, was confirmed by local police in the northwestern city of Idlib. Video footage widely shared on Syrian social media and verified by The New York Times captured the gruesome scene that followed: As Ms. Abdo gripped his lifeless body, neighbors continued to kick him.”