Why has the media and much of the political establishment made the presumed murder of an Islamist Saudi dissident on Turkish soil a defining issue in American foreign policy? Jamal Khashoggi is not a U.S. citizen, despite his past residence in Virginia, nor is he a lover of liberty, despite his criticism of Saudi Arabia’s despotic regime. He previously served that regime as a mouthpiece for, and adviser to, the alleged al-Qaeda-tied Saudi intelligence leader Turki bin Faisal. Khashoggi mourned the death of Osama bin Laden, whom Khashoggi had been granted unusual levels of access for numerous interviews. Khashoggi was...