Well sir that's the classical argument for sure.

But I do also wonder if two tribes, each following a different moral value, were put against each other in a contest such that one tribe survives and the other does not, could it not be said (controlling for other variables) that their morals proved to be objectively better. That is objective rather than subjective, but only determinable by observation and in hindsight.

Probably out of my depth here, not my wheelhouse.