If you think it is wrong to engage in activity that will predictably heighten the chances that your offspring will be born with a genetic defect, then incest with a close relative would be wrong for that reason. If you think there is nothing wrong with that, then there is nothing wrong with incest.
I wonder if existentialist would consider social restrictions against incest an unacceptable backslide towards NAZI eugenics.
I wonder if existentialist would consider social restrictions against incest an unacceptable backslide towards NAZI eugenics.