People with undesirables traits don't stop breeding. Never have. Because what's undesirable is usually determined by social rules, nothing to do with nature.
Nature only cares about lethal traits. Breeding don't produce superior humans, just humans who are good enough to breed again. By its very nature the result is a large variety of people. Because the system only works when everyone is a little bit different. The Masterrace theory is created by retards who don't realise that it is so very easy to wipe out a people who are genetically similar with all the same weaknesses.
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