Bernstein's article is far more mythical than its title implies. He says "only" 40,000 Americans would have died invading Japan, had we not dropped the A-bomb. His article is replete with numbers, including the fact that 19,300 Americans died on Okinawa and Iwo Jima alone! Can he really believe that we could have captured all of Japan at only double the cost of taking those two islands?
Professor, you really flunked the course! For your punishment, go to the blackboard and write 40,000 names!