The real problem is that we have accepted that there exists a small cadre of gifted bio-ethicists who, somehow, have a special sense of what travesty it is or ought to be acceptable to bring down upon the heads of the less fortunate who happen to come under their purview.
Most disciplines have well-defined guidelines for qualifications, training and practices, but I know of none that apply to this suddenly created field of "medicine."
The only clue I can perceive is that there is a need for someone to decide what society should do with those terribly inconvenient souls who have no one to speak for them and no means to speak for themselves and from that need these so-called ethicists have sprung up full-grown and full of ideas as yet untested in the arena of discourse.
Being still quite new, those who speak first and propose most will become the spokespeople for the rest without regard for how it came to pass and, through quotes and reference in periodicals, will assume the gravity of wisdom where no wisdom has been proved to hold sway.
Helen Keller was deaf, dumb and blind, I've often wondered whether or not this would be considered a "brain injury" and I don't doubt for a second that many of these self-anointed "ethicists" would declare that she did not have the "quality of life" to justify keeping her alive.