There's a "living will" and Do Not Resuscitate orders. At least in those cases, the wish of a person is pretty clear enough. I don't agree with it but that's between their conscience and God. Schiavo's case is different in that we don't know what she wants. We do know her spouse's wishes in the case and what's more revolting than that he wants to see her dead, is that he treats her like a piece of property. Oh gee, where are the African-Americans and feminists on people being owned by other people? No ownership's implied even in marriage. You don't have the right to rape your wife just because she's taken your name. Oy!
(Denny Crane: "Sometimes you can only look for answers from God and failing that... and Fox News".)