I'm content to ground behaving as though objective, scientific facts exist in the observation that such behavior reliably correlates with (and predicts) my experience of the world improving. I haven't observed anything analogous about behaving as though objective moral facts exist.
This, too, is not the epistemic high ground. I'm OK with that.
But, sure, if you insist on pulling yourself out of the Munchausen's swamp before you can make any further progress, then you're quite correct that progress is equally impossible on both scientific and ethical fronts.
I'm content to ground behaving as though objective, scientific facts exist in the observation that such behavior reliably correlates with (and predicts) my experience of the world improving. I haven't observed anything analogous about behaving as though objective moral facts exist.
Indeed you haven't, because they are not analogous. Morality is about guiding action in the world, not passively registering the state of the world. It doesn't tell you what the melting point of aluminum is, it tells you whether what you are about to do is the right thing.
...B
There seems to be a widespread impression that the metaethics sequence was not very successful as an explanation of Eliezer Yudkowsky's views. It even says so on the wiki. And frankly, I'm puzzled by this... hence the "apparently" in this post's title. When I read the metaethics sequence, it seemed to make perfect sense to me. I can think of a couple things that may have made me different from the average OB/LW reader in this regard: