You have a point, considering that in the Nazis' view, Slavic Croats were now suddenly "Aryan", while Serbs were untermenschen.
My Chapter on "The Lies Of Socialism" goes into how the Left has used the lies about where the Nazis stood in the ideological spectrum. The mythical view of the Nazis has been a convenient "bugaboo" to demonize people who actually want to study the considerable differences that do exist between human types. Thus promoting the "one world"efforts.
This has enabled those who promote the fantasy that peoples are interchangeable--the fantasy that has led to the looney immigration policies, here & in Western Europe--to intimidate most opposition.
William Flax.