Last week the Wall Street Journal published an unsigned op-ed unworthy of one of the best teams of commentators in the country. The subject was some comments Donald Trump made on Truth Social that, by surprise, displayed his trademark turbo-charged hyperbole. The Journal is usually a reliable source of sober, judicious, and fact-based analysis, but this editorial is a troubling portent that Republican Trump-Derangement Syndrome hysteria may have a negative impact on next year’s election. Trump’s heinous sin, according to the editors, is saying “that Gen. Mark Milley, the nation’s highest military officer, deserves execution—as in death. He said NBC...