The official reason for the FBI raid on Robertson’s home emerged later that day in the form of a federal criminal complaint originally filed under seal and detailing alleged threats Robertson made against Democratic political figures on social media. A few days earlier, in what appeared to be his final Facebook post, Robertson had written: “I HEAR BIDEN IS COMING TO UTAH,” in his customary all-caps, describing the president’s anticipated Aug. 9 visit to Salt Lake City. “DIGGING OUT MY OLD GHILLIE SUIT AND CLEANING THE DUST OFF THE M24 SNIPER RIFLE. WELCOME, BUFFOON-IN-CHIEF!” “I just can’t believe this required...