He also might not be an antisemite, but he keeps going back to Holocaust Revisionism recently.
So even by 1946, the seeds doubt about the cause existed and an object lesson in suppressing them was available.
Buchanan takes advantage of widespread historical ignorance to make a few childish points about World War II. Yes, Pat, it was an ugly affair and more morally ambiguous than we might like, but the destruction of Nazism and Japanese militarism were not negligible accomplishments. That we could not immediately defeat Communism was sad, but does not negate the other accomplishments.