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Originally Posted by sapiens
This issue with inbreeding is not dominant genes, it's recessive genes. Most genetic disorders are a result of deleterious recessive genes. Deleterious recessive genes are maintained in populations because they are recessive. Dominant deleterious genes are selected out of gene pools very quickly. If you combine deleterious recessive genes with inbreeding, you significantly increase the chance of their expression.
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that may be true, however it's the Amish way to not marry outside of the Amish. Even if inbreeding led to them growing 2 heads, it wouldn't hurt anyone but the Amish.
Again, I believe in freedom of choice. If the entire society CHOOSES to do something, that's up to them, as long as it's not hurting OTHER societies.