Perhaps so.  But the right to self-terminate is one that is recognized in a few nations these days, after judicial review.  If you are terminal, and can show a court that you're not simply depressed, there are things that can be done.  Regardless, it's a matter of reality that most any adult has self-ownership under the concept of 'right to destroy', because no one is held responsible should you kill yourself.  And most everyone has both the chance and resources to do themselves in, and there isn't usually much a law against suicide can do about that.