Heh.Peter Holmes wrote: ↑Sun Jul 22, 2018 12:28 am
So I conclude you're content with the following logically valid argument.
P1 If morality is what God desires, then morality is objective.
P2 Morality is what God desires.
Conclusion: Therefore, morality is objective.
But before we go on, do you agree that the logical validity and the soundness of an argument are completely different things - so that a valid argument can be unsound?
Absolutely. That's one clear implication of the axiom, "ontology precedes ethics." If my ontology is right, one set of conclusions logically follows; if yours is right, quite a different set follows.
But now, here's your problem: IF monotheist ontology is correct, then you have unilaterally declared that morality can be validly represented. And IF monotheism is also true, then it's not merely valid, but also sound and fully rational to believe. (Now, you don't believe that my ontology is true; but that butters no parsnips here: we haven't even reached the "truth" question yet -- we're just asking if the argument can even potentially be made rational, not whether or not you suppose that you have reasons to accept it.) You have shown that monotheism is capable of rendering a valid syllogism for the existence of objective morality. And I agree. And we can see it can.
However, the same cannot be done for subjective morality. There is literally no set of premises that will render it even valid in form, let alone true and sound. For as you have pointed out earlier, and repeatedly so, subjective morality inherently makes no claims about morality. It has, as you say, no reference to any moral facts, duties or required values. It can neither rationally give us a basis to approve what we may intuitively feel is good (say, giving care to orphans) nor disapprove what we intuitively know is deeply evil (say, genocide or slavery). It's utterly morally uninformative.
In short, the idea of subjective morality isn't even valid. It cannot be made valid. And instead of informing us about morality, it essentially denies that any morality can exist, and thus inevitably issues in Nihilism.
And that's my case. There it stops.