I didn’t say that incest was ok for all time if there were no risk of genetic malformations. I only said that it was allowed until it was deemed unnecessary. Than it was forbidden because there would be risk of genetic malformations.
The possibility of that happening is well known in both the historical world and scientific evidence. Any groups of humans that have specific physical traits to that group is very much likely from a narrow point in their history, which would obviously include the possibility of incest.
Satan tried to ruin the chances of the Hebrew line that brought about a prophetically consistent Messiah that would fulfill the accuracy of the prophets God had anointed. There are numerous examples of Satan trying to up-end the plan. Onan being one of the most obvious.
I recall asking a pastor about all of Solomon’s wives, concubines, etc. And why that was “okay” with God back then, but not now.
He replied something like “It wasn’t okay back then, but God was trying to teach them other, more important things first.”
I’m thinking the incest thing might have been similar. An earlier post mentioned Adam’s fall, and that we are all stained by that. And how Christ is related to Adam. If their were other created humans, that would be a problem.
I wonder if some of the incest problem isn’t handled by the Nephalim(?)early on that were allowed to have relations with humans at first. But after the flood are now only in spirit form (demons), or so I have read.