Dak
mentat
Buchanan even cites it himself, "the Judeo-Bolsheviks" to the East. I do not feel like watching all 7 parts or reading his book, but I doubt he mentions whether or not a superior Nazi Germany or a superior Stalinist Russia is better for the World. Then Buchanan attributes the invasion of Greece on the West, which is also out there. Mussolini went first, failed, and then Nazi's went in and took all the Jews out.
His contention is that Germany and Russia would have bled each other out absent any interference, and that Soviet Russia was a much greater danger to the rest of the world in any case. Those both appear to be legitimate positions to me.
Hitler was a mad man
Depends on what you mean by "mad". It's generally assumed he did go insane as the war turned against Germany, but you can't just point to an atrocity and assume those responsible are irrational in all areas.