Comment by benlivengood

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.