Interesting arguments. While some of his foreign policy objectives mirrored those of the Kaiser and of the 19th century expansionists, Hitler was something else. I don't use the word evil, but he was the embodiment of the mean, envious, spiteful, iconoclastic, inherently racist, post-war European lower middle class who ached for power and blamed everyone else for their problems. Fascists in other words.
Here's what the Kaiser thought of Hitler:
"For a few months I was inclined to believe in National Socialism...But of our great Germany, which was a nation of poets and musicians, of artists and soldiers, he has made a nation of hysterics and hermits, engulfed in a mob and led by a thousand liars and fanatics..."




. What about the rights of everyone else? There are countries with laws that exclude people from voting or ruling the country.
There's a world of difference between ideas on the one hand and the deeds that result when these ideas are put into practice. Your historian knows the difference. He's only talking about the "principles which enabled his acts and behaviour" not about his acts themselves. And I agree with him that Hitler was not original, and that he got his ideas from elsewhere. To call this ideology spouting maniac an original thinker is to give him a compliment he doesn't deserve. 