Yea there is not much evidence against it in 21 century as it is banned on arbitrary reasoning. Jon Haidt calls it moral dumbfounding:Right... And that was confirmed by a detailed study of all the contemporary sociological and psychological journals of the times was it? :hiding: Get real.
Any sort of assessment of psychological states when we barely know the names of a few people concerned is totally impossible. Even when we know rather more because of the preservd literature, as with the Roman Emperors about all we can do is take a stab at whether they were mildly disturbed, completely crazy, or totally sociopathic. All the same, an interesting point. The article confirms the widespread and effectively general taboo and the reasons for it, but obviously the damage is potentially mitigated to some degree by an environment where the practice is generally accepted. But in the 21st century, with which we are concerned, there are no such societies so the point is mute.
Jonathan Haidt (2001) greatly de-emphasizes the role of reasoning in reaching moral conclusions. Moral judgment is primarily given rise to by intuition with reasoning playing a very marginalized role in most of our moral decision-making. Conscious thought-processes serves as a kind of post hoc justification of our decisions—that is, after the moral decision has been made.
His main evidence comes from studies of "moral dumbfounding" where people have strong moral reactions but fail to establish any kind of rational principle to explain their reaction. Imagine that a brother and sister slept together once, no one else knew, no harm befell either one, and both felt it brought them closer as siblings. Many people still have a very strong negative reaction to this story, yet they can't explain why using Kohlberg's principled moral reasoning. Haidt suggests that we have unconscious, affective, moral heuristics that guide our reactions to morally charged situations and our moral behaviour, and that if we are asked to reason we do so only after we have made the decision.
http://en.wikipedia.org/wiki/Social_intuitionism
Although, it was a general taboo throughout known human history, so was gay marriages, but it doesn't prove the alleged argument against it and the communities that practiced it normally like the Zoroastrian, they do show argument against the conventional reasoning. There might be other's but Zoroastrian is the closet to our time and relatively easier to study with widespread practice in common people.
But it is missing the main point, if hypothetically, lets say there is a Zoroastrian country and it stages an event in support of incest in US or UK within their embassies in these respective countries, how would the people in US or UK feel? Acceptable or disrespectful?
Good discussion on another forum on the same topic: http://forums.randi.org/showthread.php?t=115022 (covers genetic defects and covers sociological arguments made against it)
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