smv1172 said:
The chances for genetic issues caused from the offspring of even first cousins is typically less than the genetic issues for having children once you at 40 years old, and that is pretty widely acceptable. It makes sense to form family units outside of your established kinship group, and my enculturation makes it so cousin marriage seems pretty horrific, but its pretty common throughout the world, and there is no reason to freak out over the chance for deformities, we have much bigger variables mixed with that than cousins procreating.
This is a large part of why I say I have no problem with it.
The original source of the taboo lies strongly in the concept of 'strong blood'.
After generations upon generations of close-knit family breeding, there IS the chance for aberrations and genetic defects to become common within the genetic line. But this is a GENERATIONAL thing, that usually takes many cycles of 'inbreeding' to occur. And it really is just a shot in the dark.
The chances of a family line having so many flaws in their genetics that it would become non-viable has always (from everything I've ever read on the matter) been relatively low.
It was, for many centuries, not even uncommon for half-siblings to marry and procreate... usually with an equally minimal amount of genetic damage.
The exceptions, of course, are always for those whose family carries strong, dominant genes. Back in the day, there was no way of detecting these genes however. And so they were spread within families, until severe results occurred.
Since then, we have gotten quite skilled in the art of genetic screening.
Still, it is the social awkwardness of the family unit that predominantly prevents breeding within the structure. Add onto that the great deal of hostility to which most families would respond, and you have the creation of a new norm.
It matters little anymore about genetics, though.
Now it is all about the socially awkward stigma which has been attached.