Good point, Disney seemed more intent on mocking Hitler as a stupid, whiny idiot that loves to hear himself talk while overworking his people. It did pay some mine to the concentration camps with Reason being guarded by Emotion and that large sign that said "Concentration" on it.
Of course, some of other Disney's works like this one seemed to mix some humor and horror, of course horror was more dominant in this one.
https://www.youtube.com/watch?v=6vLrTNKk89Q
One of the weirdest interpretations of Sleeping Beauty, that's for sure. Who the heck would picture Democracy in the role of the evil witch, while Sleeping Beauty (an obese blonde that needs saving is portrayed as Germany) and Hitler is shown as the knight that saves her (of course, he and Germany are shown as raging lunatics) and the poor horse.