Killing people suffering from PVS reminds one of the Nazi
concept of 'life unworthy of life'.
Incidentally, some time ago, someone tried to organise a petition
against Michael Schiavo, claiming that his diocese made a mistake
in allowing him to receive the Sacrament of Holy Matrimony. The
grounds were that he had procured the death of Terri Schiavo
through the civil legal system and under such circumstances, Canon
Law states that permission to receive the sacrament again cannot be
granted.
regards,
obiterdicta