They were talking about difference types of people NOT people whose spirit left fifteen years ago. And you seem to be unaware that NO society pours such vast resources into hopeless cases as has been done in this one.
Twenty five yrs ago this would not even be an issue and Terri would have died quickly. Now we artificially prolong these deaths.
So what of those people who come out of these states 10, 15, even 20 years later? By your logic, they would all be dead.
Oh, and by the very act of you breathing, you are artificially prolonging YOUR death too.
Who are YOU to say who to kill and who to save?