So says Year Zero: A History of 1945 by Ian Buruma. (The Economist's review is here.) That, I suppose, is what we call victors' justice.
One wonders what interrogation guidance those Americans had to hand - clearly more robust ones than the those about enhanced interrogation techniques that caused so much fuss recently: you will recall that the notorious 2002 'Bybee Memo' inclined to the view that "serious physical injury, such as organ failure, impairment of bodily function" was torture and therefore not allowed. That, I suppose, is what we call moral progress.