TimS comments on Holden's Objection 1: Friendliness is dangerous - LessWrong
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Wouldn't CEV need to extract consensus values under a Rawlsian "veil of ignorance"?
It strikes me as very unlikely that there would be a consensus (or even majority) vote for killing gays or denying full rights to women under such a veil, because of the significant probability of ending up gay, and the more than 50% probability of being a woman. Prisons would be a lot better as well. The only reason illiberal values persist is because those who hold them know (or are confident) that they're not personally going to be victims of them.
So CEV is either going to end up very liberal, or if done without the veil of ignorance, is not going to end up coherent at all. Sorry if that's politics, the mind-killer.
Isn't there substantial disagreement over whether the veil of ignorance is sufficient or necessary to justify a moral theory?
Edit: Or just read what Nornagest said
Perhaps, but I think my point stands. CEV will use a veil of ignorance, or it won't be coherent. It may be incoherent with the veil as well, but I doubt it. Real human beings look after number one much more than they'd ever care to admit, and won't take stupid risks when choosing under the veil.
One very intriguing thought about an AI is that it could make the Rawlsian choice a real one. Create a simulated society to the choosers' preferences, and then beam them in at random...
Even with a veil of ignorance, people won't make the same choices-- people fall in different places on the risk aversion/reward-seeking spectrum.