I’m planning to make an edit to the piece addressing the common alternate way of defining realism, such that it essentially is synonymous with objectivism. These classification schemes are really useful for me to think about when working on that, so thanks! As you can see in the first one, anti-realism is encompassing subjectivism—potentially confusing to someone who has read my piece, because I specifically classified subjectivism as a realist position! The issue is coming from the fact that your first diagram treats “realism” as meaning “moral claims are truth-apt, some are true, and the truth values of them are mind-independent” (which is basically the same as objectivism) whereas I’ve defined it simply as “moral claims are truth-apt and some of them are true.” Both definitions are commonly acceptable I believe, and the reason I’ve chosen the definition I did is because I want an overarching distinction between believing in mind-dependent moral truths and mind-independent moral truths. But the other way of doing things is common enough that it needs to be addressed in the piece so as to avoid confusion.
In the first categorization scheme, I’m also not exactly sure what nihilism is referring to. Do you know? Is it just referring to Error Theory (and maybe incoherentism)? Usually non-cognitivism would fall within nihilism, no? I actually don’t think either of these diagrams place Nihilism correctly.
That second diagram is pretty crazy. I don’t like it haha. I’m not super well acquainted with the monism/dualism distinction, but in the common conception don’t they both generally assume that morality is real, at least in some semi-robust sense? (And again, why the distinction between Nihilism and Non-Cognitivism? What is Nihilism referring to?)
Thanks so much for sharing! Super useful stuff for me to think about.