Donald Trump nominated Representative Matt Gaetz (R., Fla.), an unqualified toady, to the nation’s top law-enforcement office. And, in the blink of an eye, Gaetz resigned from the House to, apparently, force the shutdown of an ethics investigation into allegations of sexual misconduct, illicit drug use, obstruction, and other unsavory conduct — misconduct allegations over which Gaetz narrowly escaped being indicted by the same Justice Department Trump would have him lead. To be sure, Gaetz was not charged. He has denied any wrongdoing. And allegations, even colorable ones, are not evidence. Nevertheless, the standards of fitness for an office of...