Vladimir_Nesov comments on MWI, weird quantum experiments and future-directed continuity of conscious experience - Less Wrong
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Though not exactly a quantum immortality believer, I take it more seriously than most...
Objections mostly seem to come down to the idea that, if I split in two, and then one of me dies a minute later, its consciousness doesn't magically transfer over to the other me. And so "one of me" has really died.
However, I see this case as being about as bad as losing a minute's worth of memory. On the reductive view of personal identity, there's no obvious difference. There is no soul flying about.
Is there a difference between these four cases:
I'm not seeing it...
(Well, admittedly in the final case I also "gain" a minute's memory.)
In all the cases you listed, the remaining-you has the same moral weight as the you-if-nothing-would-happen. Arguably, the person on one side of a quantum coin only owns a half of moral weight, just like other events that you weight with Born probabilities, so the analogy breaks.