This video is pretty on topic and interesting:

The Germans were thinking along the lines of the "end is worth the means". A little pain and immorality was necessary in this century order to create a 'perfect super race' for the next centuries and to prevent pain/immorality in the long run. They wanted to create the next phase of human evolution, so man would transcend its 'primitive origins'. One can only imagine what the Nazis would've done if they had won and had knowledge of genetics we have today. Probably lots of genetic/manipulation/experimentation on humans, animals and plants, with every family getting blonde, blue eyed designer babies.