When your ideal is a world were all the Jews are dead, Slavs, Arabs, Africans and Hispanics are slaves and white people run the world from Berlin, evil isn't a highjacker, he is the pilot.
I was thinking more specifically about Marxism and Islam but Hitler did not rise to power by promising to eliminate everyone but the Ayrians. His was a promise of a return of Germany to a position of prominence in the world. He then turned that, like most tyrants do, into something else. Tyrants need an enemy on which to focus the public’s attention. He turned on the Jews and this article says he felt the same about the Arabs.
He may have had that idea all along but that was not the utopian idea he sold to the public.