Donald Trump’s distinctive rhetorical style — think of a drunk with a bullhorn reading aloud James Joyce’s Finnegans Wake under water — poses an almost insuperable challenge to people whose painful duty is to try to extract clarity from his effusions. For example, last week, during a long stream of semi-consciousness in Fort Worth, this man who as president would nominate members of the federal judiciary vowed to “open up” libel laws to make it easier to sue — to intimidate and punish — people who write “negative” things. Well. Trump, the thin-skinned tough guy, resembles a campus crybaby who...