Albert Einstein allegedly married his biological cousin and is sometimes called the smartest man in the world

English and European Royal Families allegedly married their close relatives and are called better than the European commoner peasants who they ruled

Ashkenazi Jews encouraged to marry other people in their in group to preserve their in group and praised for it

Red necks accused of incest and mocked for it

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There's a natural instinct against marriage of closely related people, say closer than cousins, and a biological reason for that instinct -- incest or near-incest increases the likelihood of genetic defects in the children of the union. It also increases the likelihood of extreme talent, but what a risk! Mother Nature knows best.