He wanted only white Germans so he got rid of anyone who didn't fit into this category. He should of instead, encouraged people from other races to come to Germany so they would breed together. It may take a while but full races would eventually become extinct, leaving us with master humans.
They would have have the speed of a Black man
The interlect of an Oriental
The craftsmanship of an Asian
And the swimming capabilities of a White man
MASTER RACE!
[Edited on 01.03.2013 4:18 AM PST]