Whittle's at his educated, rational best in that segment, schooling the shallow, pandering Stewart like nobody's business. Strangely enough, Stewart issued a retraction of his statements the next day:
http://newsbusters.org/blogs/noel-sheppard/2009/05/01/jon-stewart-apologizes-calling-truman-war-criminal
I wonder who gave Stewart a good talking-to, after the show. There's somebody in his circle who's read a bit of WWII history, I guess.