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Nisan comments on A note on the description complexity of physical theories - Less Wrong
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That's the problem - it shouldn't really convince him. If he shares all the data and priors with external observers, his posterior probability of MWI being true should end up the same as theirs.
It's not very different from surviving thousand classical Russian roulettes in a row.
ETA: If the chance of survival is p, then in both cases P(I survive) = p, P(I survive | I'm there to observe it) = 1. I think you should use the second one in appraising the MWI...
ETA2: Ok maybe not.
Indeed, the anthropic principle explains the result of quantum suicide, whether or not you subscribe to the MWI. The real question is whether you ought to commit quantum suicide (and harness its anthropic superpowers for good). It's a question of morality.
I would say quantum suiciding is not "harnessing its anthropic superpowers for good", it's just conveniently excluding yourself from the branches where your superpowers don't work. So it has no more positive impact on the universe than you dying has.
I think you are correct.