When others get to decide whose life is worth living and whose is not, it means big trouble. We're all in trouble.
We already have committees appointed to decide who gets to live and who has to die. Some of the advocates of involuntary euthanasia actually point to the fact that there are such committees as evidence there should be such committees. Just like they point to the fact that judge greer ordered the death of Terri as proof that he should have ordered her death. They are such simpletons.