This nationalist movement was making gains back when it was cool and fun, when we were the optimistic normal people while the left was the angry, emotional SJWs.
Linking nationalism with Nazism is the best way to completely alienate all mainstream support.
Its also a failure for providing for a white future.
Nazis started a war that killed 50,000,000 White Europeans, resulted in Germany getting bombed into fucking rubble, split where the commies got half of it, and left it a country full of slobbering cucks 70 years later who are actively welcoming an invasion of Africans and Muslims. Even worse they gave the left the perfect boogeyman to use to strawman all opposition to multiculturalism, causing the importation of endless millions of non-whites into white countries all over the world.
That is the end result of Nazism in practice, and it was objectively not good for white Europeans.