But the comfortable living structure must continue as things change!True. But you would still point to culture as the chief reason for the existing social structure, albeit a culture that may have diminished.There can be discontinuity. Society is capable of sudden cultural shift.
Which is very relevant right now. Our social structure clearly represents a more racist and white privileged culture that has since diminished. But the social structure is more hearty and harder to change. It obviously lags by generations. "Old money" and "old connections" don't voluntarily step aside. Having power assists in keeping power. A tautology, admittedly, but true all the same.