In the wake of the attempted assassination of former president Donald Trump, authorities are still trying to determine a motive for the shooter, a 20-year-old man from Bethel Park, Pennsylvania. But the lack of publicly verifiable information about the gunman has not stopped rampant speculation about his political leanings. In a viral Facebook post, comedian and podcaster Terrence K. Williams asserted that “the Democrats” are responsible for a long line of assassinations and assassination attempts throughout American history, including the killings or attempted killings of civil rights leaders Martin Luther King Jr. and Malcolm X, and former presidents Abraham Lincoln,...