Comment by benlivengood
18 days ago
Deontological, spiritual/religious revelation, or some other form of objective morality?
The incompatibility of essentialist and reductionist moral judgements is the first hurdle; I don't know of any moral realists who are grounded in a physical description of brains and bodies with a formal calculus for determining right and wrong.
I could be convinced of objective morality given such a physically grounded formal system of ethics. My strong suspicion is that some form of moral anti-realism is the case in our universe. All that's necessary to disprove any particular candidate for objective morality is to find an intuitive counterexample where most people agree that the logic is sound for a thing to be right but it still feels wrong, and that those feelings of wrongness are expressions of our actual human morality which is far more complex and nuanced than we've been able to formalize.
You can be a physicalist and still a moral realist. James Fodor has some videos on this, if you're interested.
Granted, if humans had utility functions and we could avoid utility monsters (maybe average utilitarianism is enough) and the child in the basement (if we could somehow fairly normalize utility functions across individuals so that it was well-defined to choose the outcome where the minimum of everyone's utility functions is maximized [argmax_s min(U_x(s)) for all people in x over states s]) then I'd be a moral realist.
I think we'll keep having human moral disagreements with formal moral frameworks in several edge cases.
There's also the whole case of anthropics: how much do exact clones and potentially existing people contribute moral weight? I haven't seen a solid solution to those questions under consequentialism yet; we don't have the (meta)philosophy to address them yet; I am 50/50 on whether we'll find a formal solution and that's also required for full moral realism.