What I mean is things like:

"Citation Index suggests that virtually nothing has been written about the cost effectiveness of reducing human extinction risks," and Nick Bostrom and Anders Sandberg noted, in a personal communication, that there are orders of magnitude more papers on coleoptera—the study of beetles—than "human extinction." Anyone can confirm this for themselves with a Google Scholar search: coleoptera gets 245,000 hits, and "human extinction" gets fewer than 1,200."

• http://www.good.is/post/our-delicate-future-handle-with-care/

I am not saying that nobody cares. The issue was raised because you said:

This seems to assume that existential risk reduction is the only thing people care about. I doubt I am the only person who wants more from the universe than eliminating risk of humans going extinct.

...and someone disagreed!!!

People do care about other things. They mostly care about other things. And the reason for that is pretty obvious - if you think about it.