handoflixue comments on Brain Preservation - Less Wrong
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This has been mentioned before, but are you taking the positive externalities of cryonics into account?
Specifically, signing up for cryonics increases the visibility and probably the credibility of cryonics. Consider also that cryonics is so tiny that one additional member has a relatively large impact.
Many of your objections to cryonics are based on the world of today, where cryonics is weird and marginalized. Have you tried recalculating your probability of cryonics success in a hypothetical world where cryonics is normal?
I think the most likely path to a world of normal cryonics is through individual signups. And I consider that world to be valuable enough to pay for a small chance of bringing it into existence.
Externalities are irrelevant if it turns out that revivification is impossible and cryonics doesn't work.
What about externalities that don't relate to reanimation? For example, we might expect an increase in public confidence in the scientific method rather than supernaturalism as a solution to the big scary problems. Perhaps there would be more STEM professionals and less clergy in a world where cryonics is common. Perhaps it will lead to increased aggregate demand for hard to cure yet rare illnesses (especially forms of brain damage).