I must agree that King George and the Republican Guard have no business getting involved in this issue, but then neither dues her husband["Vain hopes" (http://www.mccookgazette.com/story/1092240.html)].
As far as I'm concerned, you don't get to pick which wedding vows to forsake; honor them all, or forsake them all.
I would say to him, obviously she is dead to you, walk away.
To the parents, she still brings joy when she responds to them, or any stimuli. If they can afford to maintain her care, then why not let them?
According to doctors, she is totally unaware, so she obviously is not suffering.
To Ralph, I say that I pray that I'm never in a situation where I have to make the decision to let someone live or die.
Unless there is an untold segment to this story, the only one I see with a right to judge or make that decision in this case is the parents, without interference from any of us.