"Terri's brain was damaged beyond repair."
So, are you in favor of the state killing everyone whose brains is "damaged beyond repair", as in people who had strokes, Down Syndrome, retarded kids, etc. What is the damage point, below which you think that people should be killed?
Why always! A person should have the right to starve himself for no better reason than having the blues.
People who are mentaly handicapped and even in comas are conscious unlike people in a PVS.