Because from the court papers available, I have read that pretty much is the case. I have also been around this type of situation and have seen people in her condition, namely very close family members. But then again what do I know. :-)
Terri is not deteriorating. She is not in pain, her parents have offered to take full custody of her. Her husband has basically abandoned his marriage and with it his right to have a say in her life or death.
Starvation and dehydration is not a painless way to die for someone who is mentally alert, and Terri has proven herself to be mentally alert. If you want her dead so bad, then fill up a syringe and take her out yourself.