....
Inviting different genetics was probably essential to prevent various diseases related to incest. That's what happens when blond/e Aryans only have sex with other blond/e Aryans for several generations. They might be retarded, but they did something right. Their problem seems to be a broader inability to understand things like "unintended side-effects" of their control-freak desire to make their society run like a machine.
I got this theory that the major problem IS letting people with control-freak desires in positions of authority, period.
It's just that currently it may be radical feminazis.
Another place and time, it could be religious wackos. Like muslims.
Or whatever.