Some comments that I have read about this:
1. "Incest laws are about mandating morality rather than a concern over human genes or offspring disability."
My response: Life is complex enough for incest laws to be about both legislating morality and genes. Imagine the world if we got rid of all laws and policies that serve to legislate morality.
2. Supposedly, France doesn't prosecute these kinds of relationships. Sweden permits half-siblings to marry.
My response: Gross but perhaps they are making the distinction between consensual "incest" and nonconsensual (i.e., incest survivors/survivors of incest).
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