In Boulder, Colorado, eight elderly Jews were torched alive in a park. They wore red T-shirts bearing the names of hostages seized by Palestinian terrorists over 600 days earlier. Some carried Israeli flags. Walking peacefully in memory and solidarity, they were attacked with fire as a flamethrower and Molotov cocktails created flames as high as a tree. An 88-year-old Holocaust survivor was among the injured. The attacker, Mohamed Sabry Soliman, is reported to be an Egyptian national in the country illegally. He now faces murder charges. This third such targeted attack on American Jews in three months confirms a disturbing...