Ollie, listen to me, son - if you can’t sell a panegyric about Hitler in 30’s Germany, your career is done. Give it up. It’s over.
That’s just it, as stated elsewhere.
He ain’t selling his panegyric to American moviegoers, just to lefty college professors and high school history teachers. He knows this movie (like “JFK”, “Nixon” and his Fidel movies) will be force-fed on class time to kiddies across the fruited plain.