There is a right for almost everyone and everything in this country, including rights for those who have committed the most heinous of crimes.
An exception is the right to choose a peaceful and dignified time of death.
I watched two parents suffer for months in nursing homes, kept alive by modern medicines and such. On a lighter note, my mother, who was pre-deceased by my father, made a candid comment one day from her nursing home bed: "I wish Frank (my father) would come take me to heaven... but... he's probably enjoying the quiet."
I nearly fell out the chair laughing.
