We have that book - my wife and I had a lot to do with dying people, both our mothers died within a short time, and several of the handicapped clients she works with. She wrote a thesis on the accompaniment of dying people for her exams, I proofread it and researched some of the literature, so we both know a few things about it.
I don't find it sad - death is part of life, and if you have confidence in life after death, life before death can be hard to take, especially if you have to die in pain, but it can be endured.
It's a great book, I highly recommend it. Actually the accompanying texts are more consolation than anything else.