Plato had Socrates. Henry VIII had Thomas Cromwell — for a while. Donald Trump, alas, has had no one able keep him on course. As president, Mr. Trump is supremely confident of his ability to manhandle any interlocutor and, apparently, won't harken to wise counsel advising caution. He has now bared his unguarded thoughts to Bob Woodward, the siren of Washington who has spent two generations enticing commanders-in-chief to wreck their fortunes on the sharp edges of his reporting. Someone should hide the president's phone.