I think people have a basic human right to determine their own destiny, which means you shouldn't have to keep living any longer than you want to. When you feel that you no longer enjoy being alive, it should be completely within your rights to end your life however you want, assuming no one else is harmed in the process. I view it kind of like hard drug use in that I don't want people to do it and I'm not going to encourage it, but I would certainly fight to defend someone's rights to do so.