The patient in such a state has no self-consciousness or ability to feel, think, or evaluate the life of his or her own. I have no intention to claim that the human dignity of such patients is low or offended. In my opinion, what is human dignity is just irrelevant to the PVS patients themselves. A problem regarding whether or not a PVS patient is really unconscious is beyond the scope of my discussion here. I believe that what value is should be considered based on what an individual regards as valuable.
Value is the worth of something.
It is also defined as a relative merit according to the estimated desirability or utility of a thing. I think it has. In terms of life in a PVS, the life is valuable as long as someone finds it worthwhile to prolong. It is impossible to say that something is intrinsically valuable despite the fact that no one thinks it valuable. I believe that when people say X is intrinsically valuable, what is really meant is that X is valuable to the people.