It’s also useful to step back, however, and consider how valuable it is to preserve and revive people. If you’re a total hedonistic utilitarian, caring about there being as many good lives over all time as possible, deaths averted isn’t the real metric. Instead the question is how many lives will there be and how good are they? In a future society with the technology to revive cryonics patients there would still be some kind of resource limits bounding the number of people living or being emulated. Their higher technology would probably allow them to have as many people alive as they chose, within those bounds. If they decided to revive people, this would probably come in place of using those resources to create additional people or run more copies of existing people. This suggests cryonics doesn’t actually make there be more people, just changes which people there are. If you’re funding cryonics for the most intelligent, conscientious, or creative people then this might be somewhat useful, but the chances that any of us are the best candidate here are low.
It suggests that humans are fungible: if some people die, it’s no matter, because more can simply be created. This strongly goes against my intuition.
I also think that human fungibility is flawed from a hedonistic quality of life perspective. Much, perhaps most, of human angst is due to involuntary death. There has been a lot of philosophic work on this. One famous book is Ernest Becker’s: https://​​en.wikipedia.org/​​wiki/​​The_Denial_of_Death/​​.
Involuntary death is one of the great harms of life. Decreasing the probability and inevitability of involuntary death seems to have the potential to dramatically improve the quality of human lives.
It is also not clear that future civilizations will want to create as many people as they can. It is quite plausible that the future civilizations will be reticent to do this. For one, those people have not consented to be born and the quality of their lives ay still be unpredictable. Whereas people who have opted for cryonics/​biostasis are consenting to live longer lives.
I found Jeff Kaufman’s comment from the 2013 compilation persuasive:
I’m surprised that you find that persuasive.
It suggests that humans are fungible: if some people die, it’s no matter, because more can simply be created. This strongly goes against my intuition.
I also think that human fungibility is flawed from a hedonistic quality of life perspective. Much, perhaps most, of human angst is due to involuntary death. There has been a lot of philosophic work on this. One famous book is Ernest Becker’s: https://​​en.wikipedia.org/​​wiki/​​The_Denial_of_Death/​​.
Involuntary death is one of the great harms of life. Decreasing the probability and inevitability of involuntary death seems to have the potential to dramatically improve the quality of human lives.
It is also not clear that future civilizations will want to create as many people as they can. It is quite plausible that the future civilizations will be reticent to do this. For one, those people have not consented to be born and the quality of their lives ay still be unpredictable. Whereas people who have opted for cryonics/​biostasis are consenting to live longer lives.