If I were your child and I was in Terri's condition, I would much prefer that you (and others) not interfer with my natural passing. My preference for either a reasonable state of life, or for a natural death in the alternative, should not be overridden by your emotional state.
If aware, how do you know she wants to die?
I don't 'know' (I have no first hand knowledge of this matter - nor do you I assume). But various people (not just her husband, but various friends as well) have testified that she expressed that she would not want to be sustain this way. The fact that her parents apparently never heard her say such things notwithstanding.
My parents may have never heard me say such things (or simply chossen not to hear), but my wife and various friends have heard me. Strangers in the matter, such as your, should have not say, whether or not you agree with the concept.
The rest of your arguments are irrelevant to her previously expressed wishes.
You're right we are as ignorant as you are about her state of mind. (although she seems to enjoy her mother's visits as we saw in the video and she enjoyed the nurses stories as testified to in an affadavit) None of us knows if she is in misery or if she wishes to live. (and wishes to receive therapy and medication for infections)
So in this ignorance you decide to err on the side of death. It's 50/50. 50% chance we're right and she wants to live, 50% chance you're right and she wants to die. Apparently it's because it causes you emotional pain that you are willing to roll the dice and say 'Starve her. There's half a chance she'd want us to'.
It's your suffering that you want to end, not hers. That's mighty loving and kind of you.