Don't psychopaths count as evidence for "externalism"? (They know what they're doing is wrong but don't care.)
Not in and of itself.
Suppose a psychopath says "I know killing people is wrong but I don't care" and kills someone. Wearing an externalist hat, I say "See? They made a moral judgment, but it doesn't constrain their behavior." Wearing an internalist hat, I say either "Maybe it did constrain their behavior, just not enough to prevent them from killing someone, because other factors motivated their behavior that aren't present in non-psychopaths" or "Maybe it wasn't a sincere moral judgment, they were just echoing what they'...
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.