Christopher de Bellaigue at The Guardian:
The underlying problem with the advance directives is that they imply the subordination of an irrational human being to their rational former self, essentially splitting a single person into two mutually opposed ones. Many doctors, having watched patients adapt to circumstances they had once expected to find intolerable, doubt whether anyone can accurately predict what they will want after their condition worsens.
The second conflict that has crept in as euthanasia has been normalised is a societal one. It comes up when there is an opposition between the right of the individual and society’s obligation to protect lives. “The euthanasia requests that are the most problematic,” explains Agnes van der Heide, professor of medical care and end-of-life decision-making at the Erasmus Medical Centre in Rotterdam, “are those that are based on the patient’s autonomy, which leads them to tell the doctor: ‘You aren’t the one to judge whether I am to die.’”