>>46325530There are some diseases that result from having two copies of a defective recessive gene. Some of these relate to blindness or deafness. When people who have said diseases go to specialized schools for the blind/deaf, it's not uncommon for them to meat someone else of the opposite sex with the same disease.
When these people have children they have a 100% chance of inheriting their genetic disease. In the US at least, this is perfectly legal, and I'm not aware of any country where it is not.
What is the justification for outlawing consensual incest while allowing sexual relations for those who are guaranteed to give their offspring genetic diseases at least as bad, and likely far worse?