Argument dating interracial
Societies with alternative conceptions of marriage seem to have died out.
That suggests that this conception contains something useful; even if we can’t see it we should be wary of interfering with it, in the same way we are wary to disrupt our body’s metabolic balance or alter genes willy-nilly.
The difference between the obvious Inuit form of cultural evolution and the non-obvious marriage form is that of within-culture versus between-cultures evolution.
Consider: one Inuit tries the red berries and discovers they make her sick.
It would seem that all of the other differences between Greco-Roman and Judeo-Christian culture – theology, non-sexual mores, geography, technology, philosophy – had a lot more effect than the sexual mores.
Out of pure self-interest, she decides not to eat them again, and tells her friends the same.
Also out of self-interest, they decide not to eat them; those who think they can get away with eating them anyway are quickly disabused of the notion. Any claim that cultural evolution argues against gay marriage because it’s bad for the actual gay-married person must face the fact that actually gay-married people seem totally okay with it, and in fact are urging their friends to do it, the exact opposite of the red berry situation.
Everyone eventually perished from starvation and scurvy.
The Central Inuit have lived around King William Island for at least 700 years. Nonetheless, the British explorers starved because they did not have the necessary local knowledge, and despite being endowed with the same cognitive abilities as the Inuit, and having two years to use these abilities, failed to learn the skills necessary to subsist in this habitat.