Responding to "Homosexuality is wrong, the same way incest is wrong"

[Ravenshire]

So if there is an increased likelihood of having handicapped children, it should be outlawed.

So, anyone knowingly carrying genetics that could produce a handicapped child should be barred from procreating? If not, why not. Other than the ick factor, there really is no difference between brother/sister procreation and procreating when you know there's a likelihood of passing along something like Huntington's disease or Parkinson's disease. In fact, it's more likely for someone with early onset Parkinson's to pass on their genetic defect than it is for brother/sister lovin' to cause any problems in the first generation of offspring. Contrary to popular belief, incest doesn't start producing webbed feet or flippered appendages right away. It takes several successive generations of inbreeding to do that.

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For me there is a difference between potentially passing on a genetic defect that one or both parents have, and potentially creating one.

Have you got some evidence that incest actually creates new genetic defects?