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In moral experience, we apprehend a realm of moral values and duties that impose themselves upon us. There's no more reason to deny the objective reality of moral values than the objective reality of the physical world. Just as, in the absence of some defeater, we are rational to trust the deliverances of our senses that there really is a world of physical objects out there, so in the absence of some defeater we are rational to trust the deliverances of our moral apprehensions.
And there is no such defeater. The reasoning of Michael Ruse at best proves only that our subjective perception of objective moral values has evolved. But if moral values are gradually discovered, not invented, then our gradual and fallible apprehension of the moral realm no more undermines the objective reality of that realm than our gradual, fallible perception of the physical world undermines the objectivity of that realm. As philosopher Louise Anthony so nicely puts it, any argument for moral scepticism is going to be based on premises which are less obvious than the reality of objective moral values themselves."
