The question of “What ails the US press?” is too big for one column or one case study. Holman Jenkins takes it up in his Wall Street Journal Business World column this morning in the matter of the Steele Dossier. Whence the allegations of the dossier? We still don’t know. The subhead to the column puts it this way: “The media’s lack of interest in the Steele dossier amounts to collusion in a coverup.” The lack of journalistic interest calls for an explanation. Laziness, stupidity, herd mentality, and partisanship all seem to have something to do with the utter lack...