I've usually considered myself a caring person. Reading these discussions has made me reconsider that view, because many posters seem to express actual concern over the future of humans, and whether our species will still be around many thousands, even millions of years from now.
But me, I don't seem to care. I certainly don't wish to expedite the process by harming any fellow humans, but if our species was to go extinct in the relatively near future even (hundreds of years), I would be ok with it. Species go extinct all the time. If we don't get to spread all over the galaxy, that's fine too. We aren't any more or less important than other species. (Or maybe I feel that way merely because my sense of self-worth is very low.)