Eh? If they are PVS, how do you "offer" them food and fluids by mouth?
I think you kill them when you take them off the tube, period. This "offer them food and fluid" business is just a cop out for ducking your responsibility to the patient. Statistically, SOME of those patients -- maybe all of them, we don't know -- are "in there." SOME of those patients -- maybe all, we don't know this either -- will feel pain and die in agony. Some of them would recover if they weren't dehydrated to death.
The author of this article was in a coma for a while and recovered.