Maybe it wasn't a sincere moral judgment, they were just echoing what they've been told, like a blind person saying stop signs are red.
But a blind person can still sincerely say that "stop signs are red". Their justification for saying so may be different from a sighted person's, but the statement is still sincere (the blind person really believes it).
Is it part of the internalist claim that it is just impossible to acquire moral knowledge by such third-party means? For instance, simply observing what other people say about "right" and "wrong" and building an inductive concept about what actions the words describe, but without any emotional preference for "right" over "wrong"?
I can't speak for internalism, but it certainly seems to me that what I'm doing when I say that it's wrong for me to eat pork by the standards of Judaism is different from what i would be doing, were I an observant Jew, if I said it was wrong for me to eat pork.
Despite being (IMO) a philosophy blog, many Less Wrongers tend to disparage mainstream philosophy and emphasize the divergence between our beliefs and theirs. But, how different are we really? My intention with this post is to quantify this difference.
The questions I will post as comments to this article are from the 2009 PhilPapers Survey. If you answer "other" on any of the questions, then please reply to that comment in order to elaborate your answer. Later, I'll post another article comparing the answers I obtain from Less Wrongers with those given by the professional philosophers. This should give us some indication about the differences in belief between Less Wrong and mainstream philosophy.
Glossary
analytic-synthetic distinction, A-theory and B-theory, atheism, compatibilism, consequentialism, contextualism, correspondence theory of truth, deontology, egalitarianism, empiricism, Humeanism, libertarianism, mental content externalism, moral realism, moral motivation internalism and externalism, naturalism, nominalism, Newcomb's problem, physicalism, Platonism, rationalism, relativism, scientific realism, trolley problem, theism, virtue ethics
Note
Thanks pragmatist, for attaching short (mostly accurate) descriptions of the philosophical positions under the poll comments.
Post Script
The polls stopped rendering correctly after the migration to LW 2.0, but the raw data can be found in this repo.