Wahhabism, the wellspring of terrorist violence Poughkeepsie, N.Y.: Re “Let jihadi killer live: lawyer” (Feb. 14): Much has been made about “his ISIS-inspired worldview,” which led bike path killer Sayfullo Saipov to hit New York with its worst day of terror since 9/11. Yet it needs to be emphasized that neither ISIS nor Al Qaeda was the originator of that ideology of death. In his important new book “Without Borders: The Haqqani Network and the Road to Kabul,” veteran Afghan wars correspondent Jere Van Dyk writes of a lunch he had with freedom of the press martyr Jamal Khashoggi not...