Incest would have a higher probability of genetic disorder being expressed than with unrelated parents.I think his point was normal, unrelated consenting adults could conceive a baby that had deformities, but they'd be allowed to carry it to term, if they wanted. What do you see as the difference in the two cases?
Regarding public policy, each society will decide how to balance reproductive freedom vs allowing 2-headed babies to be born.
I'm not advocating any particular agenda.
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