In fact, all the arguments we've heard in favour of assisted suicide break down under analysis. What looks at first blush like someone's firmly-held, well-thought-out desire to die often turns out, research has found, to be fear of burdening family or care-givers, a passing moment of despair, or the product of inadequate pain control.
There are also a rather surprising number of cases in which a treating doctor decides to hasten death without the patient's consent, never mind volition. In light of that, extending the power of life and death to relatives or friends seems downright foolish.
Being alive is NOT the problem.
The problem is lacking the will to live. It is a pain issue. Or a spiritual issue. Or a psychological issue.
Existing is not the problem.