I honestly haven't gotten much of a sense of altruism or care for others. (You were serious, right?) I mean, yes, there's the whole optimizing charity thing, but that's often (not always) for personal gratification as much as sincere altruism. I suppose people here think that their own cryonic freezing is actually doing the world a huge favor.
And care for others...that's something Mormons definitely have on you guys.
But I like this environment anyways. Because people here are smart and educated, and some of them are even honest. :)
By signing up for cryonics you help make cryonics more normal and less expensive, encouraging others to save their own lives. I believe there was a post where someone said they signed up for cryonics so that they wouldn't have to answer the "why aren't you signed up then?" crowd when trying to convince other people to do so.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.