Students of the Stalinist purges of the 1930s will recall the astounding confessions made in open court by the accused persons. They had been severely tortured over weeks and months. But they showed up in court without external marks of torture. With all apparent voluntariness, they admitted subverting the Five-Year Plans that would have provided the Soviet people with necessary food items. They sabotaged factories, making sure the production lines were inefficient. They managed to import inferior metals so that Soviet tanks and automobiles would fall apart after a few months’ use. They infiltrated the Soviet Army and through dint of their persuasiveness, convinced the foot soldier that it was absurd to risk his life defending a dictatorial government. In short these accused persons, briefly in court on their way to the firing squad, took responsibility for everything that had gone wrong for the past two decades in the Union of Soviet Socialist Republics.

So why is it today that no one draws the connection between the Soviet purge trials and the confession of Khalid Shaikh Mohammed?...