While I'm not planning to pursue cryopreservation myself, I don't believe that it's unreasonable to do so.

Industrial coolants came up in a conversation I was having with my parents (for reasons I am completely unable to remember), and I mentioned that I'd read a bunch of stuff about cryonics lately. My mom then half-jokingly threatened to write me out of her will if I ever signed up for it.

This seemed... disproportionately hostile. She was skeptical of the singularity and my support for the SIAI when it came up a few weeks ago, but she's not particularly interested in the issue and didn't make a big deal about it. It wasn't even close to the level of scorn she apparently has for cryonics. When I asked her about it, she claimed she opposed it based on the physical impossibility of accurately copying a brain. My father and I pointed out that this would literally require the existence of magic, she conceded the point, mentioned that she still thought it was ridiculous, and changed the subject.

This was obviously a case of my mom avoiding her belief's true weak points by not offering her true objection, rationality failures common enough to deserve blog posts pointing them out; I wasn't shocked to observe them in the wild. What is shocking to me is that someone who is otherwise quite rational would feel so motivated to protect this particular belief about cryonics. Why is this so important?

That the overwhelming majority of those who share this intense motivation are women (it seems) just makes me more confused. I've seen a couple of explanations for this phenomenon, but they aren't convincing: if these people object to cryonics because they see it as selfish (for example), why do so many of them come up with fake objections? The selfishness objection doesn't seem like it would be something one would be penalized for making.