The incendiary on air war that broke out earlier this week, pitting several of the most prominent Fox News channel personalities against each other, has cooled off for the moment. The sudden flare-up of simmering grudges between Fox News’s opinion and news sides that finally boiled over into public view involved opinion host Tucker Carlson, news host Shepard Smith, and the channel’s senior legal analyst Andrew Napolitano. The war of harsh words that went back and forth on Carlson’s and Smith’s programs Tuesday and Wednesday, which also involved Carlson’s guest, Republican attorney Joseph diGenova, was unprecedented and was immediately seized...