Dr. Louise Campbell:

That is an important question. The autonomy condition alone is not sufficient to bear the weight of a defence of a legalised practice of this nature. It absolutely must be taken in conjunction with the welfare or beneficence condition, which is the duty to relieve suffering. This is the relief of suffering which is otherwise intractable. In Europe, that refers both to mental suffering, that is, suffering caused by psychiatric illness alone, and to physical suffering and the psychological issues that arise from that.