It's not that insane when compared to the alternative.
Dying in the jungle in pursuit of the fountain of youth or bathing in the blood of the young rightfully comes off as bonkers to healthy people.
Check your arrogance levels, they're way off.
Sane people are actually very much afraid of death. Anyone would have a much easier time proving that it is insanity not to be afraid of death, than the opposite.
> It takes a weird sort of narcissism to pursue cryonics.
It takes a much nastier sort of narcissism to be judgemental about how people decide their bodies will be handled after death.
> Dying in the jungle in pursuit of the fountain of youth or bathing in the blood of the young rightfully comes off as bonkers to healthy people.
Nobody is bathing in blood. If this is what you are actually reading in this topic, I recommend therapy.
A more neutral example would be someone who thoroughly investigates dietary health, and makes sure to eat a nutritious, healthy diet full of fresh vegetables and whatnot. Which is CLEARLY insane, /s.
I think people are comfortable only because it is inevitable. Given a universe that death did not exist in, would you consider it sane to introduce it?
Considering the long history of the motivation of seeking immortality in literature, and that it's not typically presented in a "hey, look at this freak, what sort of nutjob would want to be immortal, am I right?"[0] sort of way, I think your use of the words "sane" and "weird" aren't on the right track.
Narcissism... sure. But a normal sort.
Also, religions in general seem to spend a lot of time and effort on helping people overcome discomfort with death. Why? Are most people insane, then?
[0] Cautionary tales aplenty, yes, but authors don't typically expect the reader to consider this as a strange motivation, I would say. Why caution against pursuing something no sane, merely-ordinarilly-narcisistic person would pursue anyway?
What? Why should people be perfectly accepting of cessation of existence at ~80? People not wanting to die at 20 is perfectly normal, are you meant to get bored of life at 80 or something?
>Dying in the jungle in pursuit of the fountain of youth or bathing in the blood of the young rightfully comes off as bonkers to healthy people.
Let's rephrase that a bit to apply to money:
>Dying in the jungle in pursuit of the city of El Dorado, or killing people and selling their organs on the stock market rightfully comes off as bonkers to healthy people.
...and therefore pursuing money is clearly psychotic, and we should throw all entrepreneurs in the loonie bin?