Morendil comments on MWI, copies and probability - Less Wrong
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I value having a future that accords with my preferences. I am in no way indifferent to your tossing a grenade my way, with a subjective 1/2 probability of dying. (Or non-subjectively, "forcing half of the future into a state where all my plans, ambitions and expectations come to a grievous end.")
I am, however, indifferent to your taking an action (creating an "extra" non-interacting copy) which has no influence on what future I will experience.
I wouldn't be happy to experience waking up and realizing that I was a copy about to be snuffed (or even wondering whether I was). So I would prefer not to inflict that on any future selves.
It doesn't really seem to matter, in that case, that you wake them up at all.
And no, I wouldn't get very worked up about the fate of such patterns (except insofar as I would like them to be preserved for backup purposes).