Even if we were to credit Michael Schiavo's account of his conversation with Terri before her injury — which I am not inclined to do — it is a mistake to assume that people can make decisions in advance about whether to have themselves starved to death if they eventually find themselves disabled. That's why living wills have proven to be so often unreliable. One does not know how one will actually feel, or how one will feel about one's life and the prospect of death, or whether one will retain a desire to live despite a mental or physical disability, when one is not actually in that condition and when one is envisaging it from the perspective of more or less robust health.
Consider the case of a beautiful young woman — an actress or fashion model perhaps — who is severely burned in a fire. Prior to actually finding herself in such a condition, she might have supposed — and even said, if the subject had come up in a conversation — that she would rather be dead than live with her face grotesquely disfigured. But no one would be surprised if in the actual event she did not try to kill herself by starvation or some other means, and did not want to die.
George is of course against starving Schiavo to death. The whole interview is here.