Unfortunately when arrive at this decision it is the one option that solves all of their problems.Once they decide on this action there is no stopping them. If the intention known, you can delay it but not stop them. Their view is one dimensional and they do not see the effects of those who are close to them. Those near to the person are deeply hurt and cannot understand it. The blame they carry is huge. I have seen it many times and there are no words I can muster to lesson the pain they feel. It is a selfish thing, only humans are capable of this act.