One certainty about the assassination attempt two weeks ago on former President Donald Trump is that rampant conspiracy theories about it will endure—probably forever. The fascination with spectacular, if highly improbable explanations long predates social media. Yet it resonates now with the Trump shooter’s documented search for information about the JFK assassination, which has sustained a cottage industry of books, movies, and other content for more than half a century. Wild claims about everything from Trump staging the attack to the Biden White House orchestrating it began spreading online just hours after the fateful campaign rally on July 13 in Butler, Pennsylvania.