I don't know that the purpose of Terri's continued existance in this world was for her parents to extract some personal joy out of it. However good their intentions.
I think they just couldn't let her go, and I don't blame them.
Doesn't mean it was best for Terri to keep her in this state indefinitely till some other medical complication made the life vs death question more compelling.
I read that the parents have decided after receiving spiritual guidance from Jesse Jackson, to accept Terri's passing as God's will.
There is a time to die for each of us. God knew when Terri was going to die. That we can accept. Was it God's will that Michael lie, cheat, torture, and a judicial system act in with corruption? I think not!! He KNOWS everything, and He will have the FINAL SAY someday, but right now, corruption and evil rules the day, no doubt about it.