I'm seeing a disturbing amount of groupthink here. We're all assuming that cryonics is a good thing, and that the only thing in dispute is whether the amount of good that cryonics generates is worth the cost. However, given that no one who has been cryogenically frozen has yet been revived, how do we know that cryonics is a good thing at all? I mean, what if the freezing process somehow changed neurochemistry so that everyone who came back was a psychopath? Given that we don't have any evidence either way, why are we all jumping to the conclusion that cryonics is something that we'd all sign up for if only we had the means?