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> What prevents us from using traditional selective breeding on humans?

Much human breeding is traditional selective breeding (whether using sperm/egg donors or more ancient methods, pairings are often selected based in part on the expected genetically-determined qualities of any offspring), but it's just not a program maintained over many generations with consistent selection criteria, outside of conspiracy theories and science fiction (e.g., Heinlein’s Howard Families.)

Shorter term (usually not by intent) eugenics programs have been tried, and they are usually moral disasters tied to movements that are rapidly (sometimes violently) rejected, or at least the eugenics portion of the program is abandoned before long.

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