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Overcoming Bias Commenter's avatar

Robin, if we are to apply probability theory to moral claims in a nontrivial way, there has to be correlations between moral possibilities and our sensory perceptions, otherwise Bayesian updating becomes a null operation. But such correlations seem untenable since our sensory perceptions are determined by physics, and physics is independent of morality. The atoms in my brain and the universe in general will do the same things whether "killing is good" or "killing is bad", so nothing I can perceive can possibly provide any evidence as to which is the case.

"Impossible possible worlds" doesn't suffer from this problem.

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Robin Hanson's avatar

My post "Why Not Impossible Worlds" appears today.

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