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loqi comments on Strong moral realism, meta-ethics and pseudo-questions. - Less Wrong
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But I just described two kinds of subject matter that are the only two kinds of subject matter I know about: physical facts and mathematical facts. "What should be done with the universe" invokes a criterion of preference, "should", which compels humans but not Babyeaters. If you look at the fact that the Babyeaters are out trying to make a different sort of universe, and the fact that the humans are out trying to make the universe make the way it should look, and you call these two facts a "disagreement", I don't understand what physical fact or logical fact is supposed to be the common subject matter which is being referred-to. They do the babyeating thing, we do the right thing; that's not a subject matter.
The problem I have with this use of the words "should" and "good" is that it treats the them like semantic primitives, rather than functions of context. We use them in explicitly delimited contexts all the time:
Since I'm having a hard time parting with the "should" of type "Goal context -> Action on causal path to goal", the only sense I can make out of your position is that "if your goal is [extensional reference to the stuff that compels humans]" is a desirable default context.
If you agree that "What should be done with the universe" is a different question than "What should be done with the universe if we want to maximize entropy as quickly as possible", then either you're agreeing that what we want causally affects should-ness, or you're agreeing that the issue isn't really "should"'s meaning, it's what the goal context should be when not explicitly supplied. And you seem to be saying that it should be an extensional reference to commonplace human morality.