It would not have eased Mrs. Schindler's pain. It would not have changed the outcome.
It may have only encouraged those who would disrupt what had been decided for Terri. The ugliness and distrust surrounding Terri's situation was far beyond the simple and benign motives you pretend were involved here. A long long series of events led to strict limitations on what was allowed to be done to Terri, limitations that would never exist in a normal circumstance like this. This situation can't even be put in the same ball park as normal.
I feel for the utter desperation Mrs. Schindler must have felt.... but that utter desperation was the reason for the very strict limitations, and the reason for the cops.
Can you put yourself in her place and still say that? You have someone you love deeply dying of dehydration and you are convinced that person can still feel. You wouldn't be eased if you were allowed to give her something that he fervently believed eased her suffering in her last days?
It would most certainly have eased Mrs. Schindler's pain, and if it would not have changed the outcome would difference would it to make to let her do it?
I so appreciate your compassion and eloquence.