This article does a good job of distilling the disability rights argument:
http://www.slate.com/id/2115208/">Why Congress was right to stick up for Terri Schiavo.
By Harriet McBryde Johnson
Posted Wednesday, March 23, 2005, at 4:50 AM PT
The Terri Schiavo case is hard to write about, hard to think about. Those films are hard to look at. I see that face, maybe smiling, maybe not, and I am reminded of a young woman I knew as a child, lying on a couch, brain-damaged, apparently unresponsive, and deeply beloved—freakishly perhaps but genuinely so—living proof of one family's no-matter-what commitment. I watch nourishment flowing into a slim tube that runs through a neat, round, surgically created orifice in Ms. Schiavo's abdomen, and I'm almost envious. What effortless intake! Due to a congenital neuromuscular disease, I am having trouble swallowing, and it's a constant struggle to get by mouth the calories my skinny body needs. For whatever reason, I'm still trying, but I know a tube is in my future. So, possibly, is speechlessness. That's a scary thought. If I couldn't speak for myself, would I want to die? If I become uncommunicative, a passive object of other people's care, should I hope my brain goes soft and leaves me in peace?
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http://www.slate.com/id/2115208/