Once the Supreme Court legalized abortion, the sanctity of life was lost. You are absolutely right to use the term "creatures". There is much evil surrounding this case. You can be certain that Terri's case will end up before SCOTUS. It will be the 'roe v wade' of the Euthanasia crowd.
As for the notion that many live in this country, look at Holland where Euthanasia has now been legalized. Ready to die? No problem, here's a shot to help you along.
Yeah, it's a cliche', but I'm reminded of Edward G. Robinson's death scene.