I'm curious, have you followed the facts in this case? Maybe I've been too hard on you. Are you aware that the media BS you get about her being a vegetable is just that - BS? Terri can speak simple words, can follow objects, can recognized and respond to loved ones, can follow simple orders ("Open your eyes, Terri").
What IQ threshold would you set for people to be allowed to live? 70? 50? We have no idea what is going on in Terri's world, what pain she feels, what pleasure, what rudimentary thoughts. Perhaps her existance is very much like a little baby's. I understand, with (albeit declining) acceptance of abortion on demand, the temptation to set "degrees" of humanness - so we can comfort ourselves in the lie that "it isn't murder." But what do they feel? And what happens, historically, when we replace a logical criteria for humanness with a scalar one, like "brain activity"?