Dubious.Alexiev wrote: ↑Wed Apr 24, 2024 4:55 pm Actually, the notion that incest avoidance results from the biological risks of inbreeding is dubious. First of all, the risks of inbreeding are relatively slight, especially in primitive cultures in which the infant mortality rate is 50% any way.
More important, a common marriage rule in many simple cultures is that one must marry one's cross cousin, but cannot marry one's parallel cousin. Cross cousins are fathers' sisters' children or mothers' brothers' children. Parallel cousins are mothers' sister's or fathers' brothers' children.
Obviously, the genetic relationship with each type of "cousin" (many societies have different words for cross and parallel) is equally close. The difference is that the parallel cousins will be in the same clan as the potential mate; the cross cousins will not. So it appears that political and economic factors (exogamy) are far more important than genetic ones. Marriage outside one's group cements economic and political relations between groups.
These are well known facts from anthropology.
from anthropology?? that is too weak to support your argument.
It is a biological and psychological fact that incest inbreeding exists in higher animals up to human beings.
The risk vary with the closeness of the family relationship.
Infant mortality [not prominent] is not the critical issue. What is most concerning are the wide range of genetic disorders arising from incest.
The point here is, if there is no deterrence, especially for humans, the effect on the group and humanity will be disastrous in the long run. So far, the incest deterrence instinct has worked well for the human species because as the population increases they will marry outside their group and tribe.
What is relevant to the OP is the identification of the inherent incest avoidance algorithm which is represented by physical neurons within a network as a scientific fact and therefrom an objective moral fact culminating to 'Morality is Objective' as qualified to that specific fact.
From "morality is objective", that will provide objective grounds to facilitate and expedite moral progress within humanity.
If you are indifferent and give excuses like you do above, you are not contributing to expedite moral progress which is necessary given the current ongoings of evil acts all over the world.