Because Terri HERSELF can't file for divorce and it's her evil husband who presently makes ALL of her decisions. He absolutely REFUSES to divorce her for obvious reasons. He wants to be a widower and collect, collect, collect as well as he has stated that THERE WILL BE NO AUTOPSY and she will be CREMATED as soon as she passes away. There would go the EVIDENCE of his criminal act. This is NOT a nice man. He's a demon infested beast!!
I suspect that Michael Schiavo is receiving a very large sum of money to stay the course in insisting that Terri's feeding tube be removed. It is possible that he did cause her injuries and fears her rehabilitation. However, there are people of very great financial means and political and social influence who see this case as a "wedge" for euthanasia. If the influence of the Catholic Church and other pro-life forces can be defeated in what is essentially political combat, the pro-euthanasia victory can be used to further that agenda not only in Florida, but nationwide. The precedent may even be useful in Canada and other English-speaking countries, even historically Catholic Ireland.
Michael and Terri Schiavo, like Norma McCorvey and her aborted child in Texas 30 years ago, are pawns in a greater game of reducing the level of protection offered to helpless human life.