“The Republican nominee for president will be that candidate who best learns that there is no future in apologizing,” I wrote in a June 10, 2015, column. Six days later Donald Trump descended the escalator at Trump Tower and, in so doing, launched the most volatile period in American history since the Civil War. I wish I could say I had Trump in mind when I wrote the above, but as right as my prediction proved to be, I did not even know Trump was running. His refusal to back down or apologize came at a huge personal cost, but...