In the 1964 movie “Dr. Strangelove,” the part of Brig. Gen. Jack D. Ripper, described in Wikipedia as a “paranoid ultra-nationalist,” was played by Sterling Hayden. If the movie was made today, the role would go to Michael T. Flynn — on the face of it as much a paranoid ultra-nationalist as the fictitious Ripper. Flynn, though, is no fictional creation. He’s Donald Trump’s choice for national security adviser. Flynn, a former director of the Defense Intelligence Agency and a retired lieutenant general, is already known for his bizarre tweets, not to mention his bizarre management style. (He was ousted...