Bonald's post "What cultural diversity among the savages doesn't tell us" opens by discussing an objection posed by relativists to the idea that the organization of traditional Western society is natural. In particular, that monogamy and the traditional roles of men and women in society is natural. Relativists point to primitive societies which are arranged differently and conclude that since the values of traditional Western society are not universal, they must not be natural.
But in addition to the relativist argument that simply because different societies exist, they show that culture is relative, there is another challenge, which is that because societies that are organized differently are primitive, they are in some sense more fundamental than traditional Western culture. This leads to a different kind of challenge, i.e. are that the values of traditional Western culture just an artifact of a particular kind of society or are they more fundamental than that?
Bonald answers the first challenge with an intersting statement:
"As an Aristotelian, I believe that it's the complete, perfected state of a substance that most clearly manifests that substance's essence, its intelligible principle, rather than the immature states. If you want to understand human nature, look first at civilized man."
But this also relates to the second challenge as well. If primitive societies are less realized versions of less primitive societies, then the social organization of the less primitive societies is better.
I think there's definitely something in Bonald's statement. To the extent that societies come about because of spiritual impulses (and spiritual does not necessarily mean good, if we consider those societies that engaged in mass human sacrifice), then they are in touch with a more fundamental reality and are not just artifacts of an arbitary form of social organization.
Another way to consider this relates to the idea of the evolutionary development of consciousness and how it relates to society. Rudolf Steiner had the idea that apes are devolved men. Or, more precisely, the physical body of both human beings and apes originated as some kind of primate, which was neither man nor ape, but possessed the potentiality for either of them. Those members of that species which developed spiritually humanlike qualities became more human, while those who became more bestial developed into apes.
So, there developed a further split between the two lineages. And it is not just Steiner who said something like this. William James Tychonievich brought a theory to my attention (in the comments of this post) that, rather than human beings evolving from a chimpanzee-like ancestor, gorillas and chimps may have degenerated from a more human-like ancestor. This also relates to the idea of evolution having a spiritual characteristic. In that evolutionary change partly comes about by the response of species to spiritual impulses. Lamarck may have been onto something, in a spiritual sense.
Perhaps something similar might happen with societies. At some point they reach a "fork in the road", where further continuation along the same lines is no longer possible. Those who continue forward along the path evolve towards a different kind of society, while those who do not can only degenerate.
So, while some primitive societies may simply be more or less stable (like certain tribes in the Amazon) perhaps others are only primitive in the sense of their material circumstances, while they have in fact degenerated from a prior phase. This might explain some strange behaviors like cannibalism and manifestations of non-biological sexuality; they were not there originally, but have come about after a period of degeneration. Like Steiner's theory about apes and men, the prior phase would have been less sophisticated both in terms of cruelty and goodness.
For those that did successfully move to the new civilization that does not mean that the new social arrangement will be a paradise; they will have their own problems, with new possibilities for bad and good, but they will have evaded the fate of those who did not move forward.