It’s comforting now to think of eugenics as an evil that sprang from the blackness of Nazi hearts. We’re familiar with the argument: some men are born great, some as weaklings, and both pass the traits on to their children. So to improve society, the logic goes, we must encourage the best to breed and do what we can to stop the stupid, sick and malign from passing on their defective genes. This was taken to a genocidal extreme by Hitler, but the intellectual foundations were laid in England. And the idea is now making a startling comeback.
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