> who would reasonably prioritize your individual happiness and health if the cost on your society/culture means a trend toward collapse?

What evidence do you have that people living longer would cause a trend toward collapse? What evidence do you have that people who live longer and without debilitating health problems wouldn't care more about the future of our planet and society and be able to achieve more toward improving it?

You're accusing people who want to live longer of selfishly causing societal collapse acting as though you're taking a moral high road, preserving a precious thing, but you're arguing that 8 billion people alive today should die. That's a remarkable bit of ethical gymnastics and a monstrous position to take by my reckoning.

I was kind of OK with it when I was thinking, "OK, religious people believe nobody ever really dies." Which I believe is a fairy story, but one that many people believe and are raised to believe. But, yours seems to be your own brand of religion, and it doesn't even pretend people actually never die and go to heaven but you want it to happen to everyone anyway, which is really something.