The Nazi order was not "moral" in the mundane sense, the order was determined by the Nazi understanding of biological science, specifically the heritability of traits. The Nazi's looked at Germany and dertmined that it was both advanced AND ordered, they then looked at their near relatives the Anglo-Saxons, and the Dutch and saw more or less the same. The further a people diverged from Aryanism, however, the lower down the socio-economic order their society was.
You must remember that this was a widely accepted scientific view at the time, that white people were "more evolved" than other races, it was the basis for Segregation in the US Army - for example.
All the Nazi's did was take this to a logical conclusion bereft of any moral constraints - i.e. if Aryans are better than other people then application of Darwinian principles allows for the extermination of other competing populations.
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