We know from the effects of morphine that it is possible to experience "pain" without it "hurting". (I wonder if any philosopher foresaw that this is even possible?) Given that, it is quite conceivable to me that a psychopath might experience the feeling of "moral wrongness" without the motivation "I shouldn't do this". Maybe that isn't what's going on, but no process of reasoning about morality can rule it out.
Philosophers, even materialist ones, are apt to think of the mind as being some sort of logical entity, about which they can prove that certain mental behaviours are impossible. But when the brain goes funny, all of those arguments fail. Which implies that when the brain hasn't gone funny, the arguments still don't prove anything, because how do we know that even a normal brain doesn't do other "absurd" things? Only by observing how it actually works, not by any process of pure reason.
Compare "akrasia". How can you want to do a thing, have the ability, and yet not do it, all the while bemoaning the fact that you aren't doing it? Obviously absurd, impossible, a contradiction. But the fact that people do go funny in this way is so familiar to everyone that philosophers can't get far by arguing that it can't happen.
I certainly agree that we can discover things about the world that make us realize that some phenomenon P that we naively thought was indivisible in fact turns out to have internal structure, such that an event can demonstrate some-but-not-all-of P.
I'm mostly of the opinion that when that sort of thing happens, the best move is to get very clear about what level of abstraction we're talking about, what concepts apply at that level, and how we refer to those concepts. Sometimes it's useful to talk about "cells", but if I'm interested in how mitoch...
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.