lukeprog gave a list of metaethics questions here:
What does moral language mean? Do moral facts exist? If so, what are they like, and are they reducible to natural facts? How can we know whether moral judgments are true or false? Is there a connection between making a moral judgment and being motivated to abide by it? Are moral judgments objective or subjective, relative or absolute? Does it make sense to talk about moral progress?
Most of these questions make no sense to me. I imagine that the moral intuitions in my brain come from a special black box within it, a "morality core" whose outputs I cannot easily change. (Explaining how my "morality core" ended up a certain way is a task for evo psych, not philosophy.) Or I can be more enlightened and adopt Nesov's idea that the "morality core" doesn't exist as a unified device, only as an umbrella name for all the diverse "reasons for action" that my brain can fire. Either perspective can be implemented as a computer program pretty easily, so I don't feel there's any philosophical mystery left over. All we have is factual questions about how people's "morality cores" vary in time and from person to person, how compelling their voices are, finding patterns in their outputs, etc. Can someone explain what problem metaethics is supposed to solve?
But logic works! For example, establishing a non-contradictory axiom system, then observing how no contradictions seem to occur as we make deductions within the system. Appeal to inappropriate authority does not work! (Except when authority correlates with truth, and when it's not screened off). On the other hand, I don't see how morality can be said to work or not.
There may be a branch of logic which is a science of persuasion, but what it endorses and prescribes relies much on logic as a science of correct inference.
You may establish a formal system of morality, make up some requirements (say, no theorem which starts with "you ought to prefer" is produced within the system), and if you were lucky with the inference rules and axioms, then you would see that your morality works (e.g. no matter how hard you try, you can't derive "you ought to prefer killing kittens"). Clearly, that d... (read more)