He gave a diagnosis for what had gone wrong. “Secrecy keeps mistakes secret,” he said. “Secrecy is a disease. It causes a hardening of the arteries of the mind.” He quoted John le Carré on that point, adding that the best information actually came from the likes of area specialists, diplomats, historians, and journalists. If the C.I.A. was disbanded, he said, the State Department could pick up the intelligence work, and do a better job.