Partisan news media’s reaction to the historic conviction of former President Donald J. Trump was swift. Conservative websites and commentators blasted the verdict as a sham, intensifying and escalating the attacks on the prosecution and the judge that they lobbed throughout the seven-week criminal trial in Manhattan. Several websites misleadingly referred to the trial as “rigged” and “corrupt.” Liberal outlets, though, couldn’t quite agree on what to make of the verdict, even if they...