Several fundamental principles united virtually everyone in this motley crowd of scientists, doctors and propagandists for racial hygiene. The first was that heredity played a significant role in determining human character and behaviour. The second, which followed on from this, was that society, led by the state, should manage the population in order to increase national efficiency. The ‘fit’ had to be persuaded, or forced, to breed more, the ‘unfit’ to breed less. Thirdly, however these terms were understood, the racial hygiene movement introduced an ominously rational and scientific
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