Why ? I realize I'm opening myself to flames here but think about this: Michael Schiavo has no remedy under the law to get a divorce from hise wife since she is not capable of being responsible for herself under the law, or to turn her care over to anyone else. Parents can "abandon" their children to the state so the state is responsible for their care, but husbands/wives cannot do the same if the other is incapacitated, as in this case.
Wouldn't it be a better remedy if the state allowed him to divorce her, thus turning her care over to her parents or to the state iof the parents didn't step forward (which in this case we know they are eager to do) ?
There's a moral issue, and there's a legal issue. From a moral standpoint, when he married her (in the Catholic faith) he made a vow to be faithful to her as long as she lived. He has not done so. That is what I judge harshly, based on my religious beliefs (which he claims to share.)
From a legal standpoint, I think there should be some kind of mechanism to deal with situations of this kind. "Common-law divorce" perhaps. "Termination of spousal responsibility." Something, so that a person's legal guardian wouldn't be someone who wants to kill them.