Notwithstanding the observations on the other subclauses of this clause, subclause (c):
that illness, disease or disability or that state of decline causes them enduring physical or psychological suffering that is intolerable to them and that cannot be relieved under conditions that they consider acceptable; and
This is the heart of the Carter decision.
If we delete these lines, there's nothing left. Whether we delete (d), (a), or (b), we cannot delete (c). On that basis I vote against this.