They did, and because of that, Nazis killed Jews if they even made the slightest mistake, or complain too much.
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They either believed or were influenced that the "Aryan race" was superior to other races.
Nazis & the Klu Klux Klan (KKK)
If the Nazis wish to assert the superiority of the Aryan race, then they must have some other races to which they are superior. To be a master race, they must appoint slave races. Otherwise, the title becomes meaningless.
Blacks were seen as genetically inferior, but they were not persecuted in the same way as some other groups, as they were not seen as such a threat.
It was not the aryan race that 'morally superior killed' millions of non-aryans, it was one party - the Nazis whom of which most of them were not aryan, who killed non-aryans because it has been suggested that 'Hitler' did not like non-aryans
They believed that their race was superior to others. It was only a small factor in the lead up to the Holocaust, the world was and is full of nations and people who believe that they are better than others, this does not cause mass murder.