These essays are always problematic. Annie Leibovitz got a certain amount of crap for publishing photographs on Sontag's process of dying. There's a balance between grieving and exploiting that is never going to be right for everyone. Add to that the American (western?) feelings about death, and how it should be private, hidden away, and not discussed, and you get an unpleasant but interesting social situation.
Myself, I think a little more openness about dying wouldn't be a bad thing, but I did grow up in the USA and as such I am pretty steeped in that culture, so these things always open up mixed emotions. It makes it hard to comment on the pictures themselves, or even really see them in any useful way.