Many in the political and media establishment have cast the Jan. 6 riot at the U.S. Capitol as one of the darkest episodes in American history, comparing an episode in which one person was slain (a protester shot by police) to 9/11, Pearl Harbor, the Civil War, and the British sacking of the capital city in 1814. Seizing on the gravity of a mob trying to interfere with the process of recording Electoral College votes after a presidential election, Democrats impeached Donald Trump over the Jan. 6 breach and put him on trial in the Senate. Democrats have also spearheaded a congressional investigation—one focused on the former president—that will likely stretch into next election season. Republicans, Trump supporters, and others see a double standard at play in Democrats’ emphasis on Jan. 6. They note that many Democrats cheered nationwide protests and some even put up bail after the May 2020 …