There’s a large region of the right-wing media ecosystem that is littered with those always-disappointing carbon-snake fireworks. Touch one of them with a spark and it springs to life, pushing out an unbroken chain of detritus. Eventually it dies out, leaving a mess, but there are other sparks and other snakes still to be lit. On Tuesday, filings from Donald Trump’s federal indictment served as a spark. The mess that followed was unusual only in its hyperbole: because the FBI included documentation about how to handle contingencies in its August 2022 search of Mar-a-Lago, including limiting the use of firearms,...