|Well, let me cut and paste some material from the wikipedia page on Nazism, because it is very relevant here.
Hitler also claimed that a nation was the highest creation of a 'race', and 'great nations' (literally large nations) were the creation of homogeneous populations of 'great races', working together. These nations developed cultures that naturally grew from 'races' with 'natural good health, and aggressive, intelligent, courageous traits'. The 'weakest nations', Hitler said, were those of 'impure' or 'mongrel races', because they had divided, quarrelling, and therefore weak cultures. Worst of all were seen to be the parasitic 'Untermensch' (Subhumans), mainly Jews, but also Gypsies, homosexuals, the disabled and so called anti-socials, all of whom were considered 'lebensunwertes Leben' ('Life-unworthy life') owing to their perceived deficiency and inferiority, as well as their wandering, nationless invasions ('the International Jew').
According to Nazism, it is an obvious mistake to permit or encourage plurality within a nation.
Hitler claimed that nations that could not defend their territory did not deserve it. He thought 'slave races', like the Slavic peoples, to be less worthy to exist than 'leader races'. In particular, if a master race should require room to live ('Lebensraum'), he thought such a race should have the right to displace the inferior indigenous races.
'Races without homelands', Hitler proclaimed, were 'parasitic races', and the richer the members of a parasitic race were, the more virulent the parasitism was thought to be. A master race could therefore, according to the Nazi doctrine, easily strengthen itself by eliminating parasitic races from its homeland. This was the given rationalization for the Nazis' later oppression and elimination of Jews, Gypsies, Czechs, Poles, the mentally and physically handicapped, homosexuals and others not belonging to these groups or categories that were part of the Holocaust.
Does this sound familiar? :-)