[baddox]

Yes, I think we agree fully. I would add that the persistence of norms does not have to be directly genetic in the way most people would interpret that. It could be indirectly genetic, in the sense that we have a strong genetic propensity to adopt the norms of our social surroundings and attempt to spread those norms to the next generation. That propensity probably applies even for norms that have far outlived their original purpose.