PG - Hitler was not demostrating the actions of an ill-tempered windbag in that scene. He was demonstrating something far more serious than that. The scene is set in the last days in the bunker in a dying Berlin. He was a man at the last stages of despair, rage, and mental breakdown, having seen his entire regime collapsing about him like a deck of cards after 5 years of total war.

Picture G.W.Bush in a similar situation...hunkered down in some underground command centre in the ruins of Washington, with foreign troops only blocks away, with his army, navy, and air force obliterated and his whole country smashed, and his every political hope dashed to pieces...and only capture, trial, and execution awaiting him.

Do you really think a man in that circumstance, a man accustomed to having commanded a mighty empire, is going to remain calm, lucid, dignified, and entirely the master of himself and his situation?   

It is petty to remark upon the scene as depicting Hitler as an ill-tempered windbag. It's as if you don't comprehend what's going on in the film at all. A national tragedy was occurring on a simply vast and incomprehensible basis. If you were in something like that yourself, you'd never forget it.

That's why the Germans had to make that movie, and they had to get it right. There is a point when people are ready to face the memories and process the pain.