Ross Douthat argues why he thinks assisted suicide should be illegal. He argues that it would, counterintuitively, take the decision out of the hands of the individual:
But once you start to set up a system of bureaucratic safeguards, as proponents of assisted suicide (for admirable reasons) usually prefer to do, you find yourself placing the life-or-death decision as much in the hands of doctors and psychologists as in the hands of the would-be suicide himself. In effect, assisted suicide empowers a selected group of experts to pass a final, irrevocable judgment on the Millman question — to act in loco suicidium, if you will, taking it upon themselves to assess the strength or weakness of the suicidal person’s mind, and using this judgment as the basis for abetting a choice that forecloses every other choice.