answer:This is a scary question: there are certainly people who are incapable of caring for themselves, who cannot provide joy or love to their families, or even accept that love that is given them. But because we value life we value them, They may be old, infirm, severely disabled, demented or stricken with Alzheimers. Our obligation, as humans, as society, as a civilized people, is to care for them to the extent we can, to recognize their humanity and their dignity. And dignity is the issue here: whether the dignity to not want extraordinary life support, or to die in dignity, or to keep someone alive as they wish.