You know, just a thought. We all have in our memory some Hitler's speech where he is speaking, or rather yelling like a hysterical man. But this is very misleading. Privately, he was not a fool, but a affable man, peaceful and balanced in his language. He was also very cultured. He had just a passion for Germany. That such a man wanted to put to fire and sword Europe is hardly conceivable. But you will say that he concealed his intentions. I answer : too easy.
On the other hand, he had a certain contempt for the Slav peoples, I agree (though some Slavic people have a very germanic appearance !). He was ready to impose his conditions for Poland. But this didn't justify a war to the death !