Today's post, Moral Error and Moral Disagreement was originally published on 10 August 2008. A summary (taken from the LW wiki):
How can you make errors about morality?
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Nope. Incompleteness shows that there are some statements which are true which cannot be proven to be true.
However, empirically observed facts in the absence of moral imperative do not create a moral imperative. Typically ethics are formed around by a value judgement and then molded and polished by facts. I see that you are trying to trap me by saying that "I believe that this is better" is a fact, rather than allowing the value judgement "This is better" to stand.
Morality is, among other things, subjective. There is no basis in fact to prefer any system over any other system, any more than there is a basis in fact to prefer one genre of movies over another. I prefer internal consistency to internal inconsistency, and I believe that the majority of people who tend to think things through also prefer that, but I have no factual basis for that preference.
Claiming that falling down (as opposed to up) is a moral act, while not technically refutable, is hard to swallow.