Therefore, Hitler actually used the ancient agricultural methods of selective breeding to the extreme. He realized that there was too much risk that the breeding program would be thrown off course by unwanted specimens breeding with his studs. He couldn't erect a fence to keep his studs isolated from the runts, so he killed the runts so they wouldn't contaminate the gene pool
I'm not sure about this. The elite - namely the SS - were only allowed to marry after the women had been checked to have the correct physical characteristics, ancestry, ideology and so on. In effect he (well actually Himmler I think)
did erect a fence around his studs.
I think he killed the runts to stop them breeding with
themselves (no masurbation jokes please
) rather than with his supposed Aryan supermen.
Oops! Wrong Planet