Effective Altruism: An Introduction – 80,000 Hours cover image

Five: Prof Will MacAskill on moral uncertainty, utilitarianism & how to avoid being a moral monster

Effective Altruism: An Introduction – 80,000 Hours

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The Expected Value Approach to Moral Philosophy

How do you assign credences to different moral views? That's already an incredibly difficult question. Maybe some moral views don't even give you magnitudes of wrongness or value. The fanaticism problem is the worry that perhaps under moral uncertainty, what you ought to do is determined by really small credences in infinite amounts of value. And so telling a lie would still have lowered expected choiceworthiness than not telling the lie. But that just seems crazy. We shouldn't be dominated by these fringe, fanatical, seeming views.

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