It's a poor parallel. Deciding whether to let women join the military based on a utilitarian analysis does nothing to justify throwing a citizen's rights out the window and ejecting them from their home. And if you're dyed in the wool about better simply being better, then I'd point out that having sacrosanct notions, like a citizen's rights, is mo better since it affords us a stable society which isn't subject to the whims and preferences of whoever happens to be the Utility Tsar. And yes, a lot of black people are a pain in the butt. Go to their neighborhood and they'll certainly mean mug you. Quite possibly assault you. For no reason at all. A large percentage of blacks are as racist as you please and everyone seems content to pretend they're not. Still, you don't get to declare their US born citizenship invalid.
The ethnostate argument baffles me. I'm certainly honkier than thou, and far more than most. Still, 1" left of the chin sprouts a single, very suspect, thick, wiry, jet black hair. Just one. Something unpure transpired on some far distant field. Otherwise I'm about as anglo-ger-scandi as it gets, so if I struggle to squeak the white cut with that one whisker then most of you are in very deep shit if we go ethnostate.