Racial nationalism is an anti-evolution and anti-nature conceit:
Humans must not branch out and evolve.
Humans must stay within rigid boundaries.
Nature and individuals cannot mate naturally. Mating must be centrally controlled.
Mutations, the very mechnaism of evolution, are bad.
"Favored races" must not be favored races. Force is needed to stop them.
I think the reason neo-Nazis are so angry is because they're literally fighting against nature in every belief they have.
The only way they could square their political views with their scientific views is by abandoning Darwin.
But Darwin is, paradoxically, one of their heroes.
It's all very backwards and crazy.