Donald Trump, the all-knowing know-nothing

As the noted philosopher Donald Rumsfeld said, there are known unknowns (the things you know you don't know) and unknown unknowns (the things you don't know you don't know). When the former secretary of defense issued those words of wisdom just before the Iraq War, the phrase was remarkable not just for its pithiness but because it seemed unusually thoughtful for an administration about to embark on the greatest catastrophe in American foreign policy history, largely because of what it thought i...