But as life slides towards that state, it's amazing how people still find very good reasons to stick around. It's strange to us, but even blind and demented, life is still worth living.

In my little bit on experience, the only thing that makes life not worth living seems to be pain. When we're in a lot of pain, then people tend to opt out of living. But until there is pain, there's still something in life that makes it all worthwhile.