Former MSNBC host Mehdi Hasan made an astonishing claim last week at the “Together for Palestine” rally in London’s Wembley Stadium. “Two-hundred and seventy: That’s how many Palestinian journalists Israel has killed in Gaza,” he told the cheering crowd of 12,000. “More than were killed in the First World War, the Second World War, the Korean War, the Vietnam War, the Iraq War — COMBINED!” What an incredible statistic. It seems impossible that five bloody wars — which killed at least 110 million people across the globe — caused the deaths of fewer reporters than have occurred in the tiny...