But regarding the impossibility of moral progress over time: couldn't the moral relativist allow for a (they would have to say arbitrary) change of the culture's basic principles? Slavery used to be morally okay because the culture said it was, but now that the culture declares it to be wrong, aren't they allowed to integrate their new basic principles?
What I mean is, the moral relativist can't allow for improvement over time, but they can allow for change right?
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