This is as good place as any to post my rant.
Harboring a personal opinion about whether or not the behavior of another person is right or wrong isn’t a fucking crime, people. Nor is it morally objectionable in and of itself.
Frankly, the part of this thread that actually pissed me off was the blithe assumption on the part of my fellow Dopers that having an opinion regarding whether or not a given behavior is right or wrong is, in itself, wrong. Ludovic, I’m picking on you here in specific, although you’re not the only one.
What the fuck is wrong with you that you patently believe that having an opinion that someone else is doing something wrong makes me, by definition, complicit in “a snap judgement based on evolution and culture”? You seem totally comfortable having snap judgements about other Dopers just for expressing an opinion that isn’t “anyone can do whatever they like and that’s okay”.
For the goddamn record, I read the link in the OP and thought to myself “Well, that’s remarkably icky and what they’re doing is wrong”. I thought that because I, personally, have thought the matter through. Using critical thinking skills and everything.
As it happens, there are solid biological and cultural reasons for people thinking incest (particularly incest between parent and child) is just flat-out wrong. A strong incest taboo is historically probably one of the few even marginally functional ways to prevent (or at least minimize) isolated population inbreeding. And it hasn’t been that long (historically speaking) since it was commonplace for people to live their whole lives within 10 miles of their place of birth. That sort of thing tends to limit the available gene pool if there’s no drive to go out of the community to bring in new people. While close breeding in a family tree might not automatically lead to “zomg, your baby will be deformed for sure!”, it does increase the chances of - particularly when it takes place over generations.
A parent-child inbreeding situation is even worse from a genetic standpoint. A parent-child inbreeding situation means that, by definition, the parents of a resultant child will share at least 50% (and probably more, actually, since most people have at least some genetic overlap - 50% is the *best case scenario * for a parent-child breeding) of their genetic material. That concentrates the hell out of undesireable recessives (if there are any). Genetically speaking, sibling incest (taking this as a comparison because full siblings share the next-highest average rate of genetic overlap - and discounting breeding between twins) is nowhere near as unfortunate - since there’s a solid chance that even full siblings will share less than 50% of their genetic material with each other (granted, it might be higher, but chances are actually reasonable that full siblings share less than half - each will get half of each parent’s genetic material, but which half that each sibling gets will be different, and random variation comes into play in a big way here since it’s a 50/50 chance for each individual gene locus being the same copy between full siblings). Moreover, there’s no convenient way of knowing (outside full-on genetic mapping) the degree of genetic overlap between full siblings. It’s technically possible that it’s zero (or no greater than the genetic overlap between unrelated strangers). Unlikely, but possible. This is not the case in parent-child incest. In the case of parent-child incest, the genetic overlap is *at least * 50%, and almost certainly higher. That means that, on average, any child of such a mating would have approximately 75% genetic overlap with the grandparent-parent.
It’s a disaster from a sociological standpoint, too. Parent-child incest fucks with the established power dynamic of the family unit - hell it essentially destroys it. It blurs the expected roles of family members. And, frankly, there is a tremendously strong cultural incest taboo across the board. It’s such a strong taboo that it’s more than possible that a family unit engaging in incest will face ostracism and other assorted social stigma.
If it were just this lady and her dad quietly living together, fucking each other, and going about their life without cluing in the population at large and involving nobody but each other in their behavior, I’d still say it was wrong and nasty - but other than worrying about their mental state that they’re okay living their lives in a constant state of violating one of the primary social mores of their society (much as I’d worry about someone who lived their live in a sexual relationship with their dog, for example - or who felt the need to eat human flesh on a regular basis), I wouldn’t have anything to say. It would fall into my mental category of “iieeewww, that’s nasty, but it’s not hurting anyone (except possibly themselves) so it’s none of my business”.* However, in this situation, that’s not what they’re doing. They’re willfully and apparently deliberately procreating - and exposing her children and his grandchildren (to clarify, the children from her previous relationships) to the same social stigma they’ve decided to live with. They’ve additionally exposed their children (the kids they have together) to increased biological and genetic hazards, in addition to the social stigma, all so they can get their rocks off the way they want to.
That makes them selfish fucks in my book. In Australia, it apparently makes them criminal selfish fucks.
Pick another cultural more to ride your “can’t we all just be tolerant of each other’s differences” horse with, bub. The incest one has a logical and functional basis - it’s not irrational and arbitrary, unlike some other cultural mores that spring to mind.
*Lots of things fall into this category for me. Like scat fetishists and furries and the aforementioned people who have sex with their pets (although that’s more dicey from an animal-cruelty standpoint) and people who eat raw fish and cooked okra. Everyone has things that make them go “iieeeeewww, but none of my business, thank Og.”