Death, Dignity, Autonomy, and Respect for the Rationality of Persons with Mental Illnesses

After nearly a quarter of a century of political debate, physician aid in dying, or "death with dignity,"(DWD) is now legally permissible for persons with terminal illnesses in six states. The moral impetus for such laws stems from respect for patient autonomy. However, if we are truly committed to protecting freedom regarding one's own medical decisions, why are persons with mental illness excluded from the possibility of pursuing physician aid in dying?