The court erred in that they should have severed the relationship with the "husband" who at that point had another family.
Her parents should have been given guardianship. Starving someone to death while her family is grieving is inhuman. There was never any proof that this is what she wanted, only the words of a "husband" who was living with and having children with another woman.
I agree it was a heartbreaking situation. I don't know all the details because I didn't follow it as intently as many, but it must count for something that whenever a court was asked to decide, they ruled in favor of what MS wanted to do. I know all that means to you is that everyone involved was evil, but I don't believe it's that simple. I think it was clear to most that she would never recover any consciousness.
Would it surprise you to learn that Terri's parents, within a few years after she entered a PVS, encouraged Mr. Schiavo to date and to "get on with his life"?