Kicking off the first hearing of the House Select Committee investigating the U.S. Capitol riot, Chairman Bennie Thompson, a Mississippi Democrat, promised to fully investigate "the facts of what happened on Jan. 6,” calling it “a scene of violence in the citadel of democracy.” But over the next 3½ hours, he and other Democrats, along with their handpicked Republican panelists and police witnesses, never mentioned the most lethal act committed that day — the fatal Capitol Police shooting of unarmed protester Ashli Babbitt. It was the only shot fired during the entire riot.This omission angered Babbitt’s family and a number...