In You Provably Can't Trust Yourself, Eliezer tried to figured out why his audience didn't understand his meta-ethics sequence even after they had followed him through philosophy of language and quantum physics. Meta-ethics is my specialty, and I can't figure out what Eliezer's meta-ethical position is. And at least at this point, professionals like Robin Hanson and Toby Ord couldn't figure it out, either.
Part of the problem is that because Eliezer has gotten little value from professional philosophy, he writes about morality in a highly idiosyncratic way, using terms that would require reading hundreds of posts to understand. I might understand Eliezer's meta-ethics better if he would just cough up his positions on standard meta-ethical debates like cognitivism, motivation, the sources of normativity, moral epistemology, and so on. Nick Beckstead recently told me he thinks Eliezer's meta-ethical views are similar to those of Michael Smith, but I'm not seeing it.
If you think you can help me (and others) understand Eliezer's meta-ethical theory, please leave a comment!
Update: This comment by Richard Chappell made sense of Eliezer's meta-ethics for me.
If you disagree with someone, and you're both sufficiently rational, then you can expect to have a good shot at resolving your disagreement by arguing. That doesn't work if you just have fundamentally different motivational frameworks.
I don't know if I agree that a disagreement is necessarily resolvable by argument, but I certainly agree that many disagreements are so resolvable, whereas a complete difference of motivational framework is not.
If that's what EY meant to convey by bringing up the question of whether Humans and Babykillers disagree, I agree completely.
As I said initially: "Humans and Babykillers as defined will simply never agree about how the universe would best be ordered."