I see that as powerful evidence of a God, in which case this core is objective truth and a reflection of Divine law. If they are just an evolutionary survival mechanism then there is nothing objectively "good" or "bad" about them at all and I have no "moral" obligation to follow them to the extent they interfere with my enjoyment of my brief time in this world. Pragmatism is not an objective foundation for moralilty. Again, there can be no objective basis for ethics apart from a transcendent God.
But if all of society just innately ‘feels’ or ‘reasons’ that the same morals are good and right, why does there need to be some transcendent God decreeing it so—and why is such an external decree necessary?