Quote:
Originally Posted by Achilles
Within moral philosophy, rules of logic can be used to determine "moral" vs "immoral" action.
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Logic is applied to just about everything within philosophy, because it is a truth-preserving operation. Other than establishing validity, consistency and the like, it has no content on its own, it's more like a grammar.
That's why logic alone cannot be used to determine what a moral action is. For that, we'd need a set of premises as well and at least one of them would have to be normative to begin with, since we can't get any morals from purely descriptive/factual premises.
Now justifying those normative premises is quite the problem and that's where I think theistic theories have a disadvantage, as their premises involve a deity. (Which means that the plausibility of their premises is linked to the probability of the existence of that deity.. not a good thing if you ask me
) But the logical validity... well that's really a necessary requirement for any argument, if it's deductive. I'm sure there are theistic moral philosophies which are ok logically speaking.