Eugine_Nier comments on Morality open thread - Less Wrong
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So would you argue that P2 shouldn't investigate whether the cube exists, because then he would find out that it doesn't and thus become worse off?
Yes. P2 finding this out would harm him, and couldn't possibly benefit anyone else, so if searching would lead him to believe the cube doesn't exist, it would be ethically better if he didn't search. But the harm to P2 is a result of his knowledge, not the mere fact of the cube's inexistence. Likewise, P1 should investigate assuming he would find the cube. The reason for this difference is that investigating would have a different effect on the mental states of P1 than it would on the mental states of P2. If the cube in U1 can't be found by P1, than the asymmetry is gone, and neither should investigate.
Very well, I repeat the advise I gave you above.