There are a lot of things that people repeat over and over until it gets accepted as some universal truth. The police are on your side, the soldier is fighting for your freedom, US is the land of the free, respect your elders, family are more important than anyone else, and so forth. One of these thing that I keep on hearing people say is that "suicide is not the answer".
Why not? See the interesting thing about indoctrinated lies that people learn from constant exposure to these ideas since they are children is that these concepts never have much of an argument to them. They are never really justified, just repeated to the point that people repeat it themselves. I heard many times that suicide is not the answer in my life. But no one ever said why it is not.
Suicide can be a means to deal with a problem. Suppose that a person is in a lot of pain. He has no more reason to keep on living. Why should he continue to suffer if he can die peacefully? I would argue that it makes more sense for him to kill himself (or delegate that right to someone else so that his friend can kill him) in such a condition.
A lot of friends think it is noble to say "I will never assist you in suicide", but why is that a noble statement? You are a friend, you are supposed to be there for him in his darkest hour. And your friend has thought through his position and came to the sad conclusion that his life needs to end. If you do not help him then you are a bad friend. I am not talking about whether you can make yourself to help him or not. That is a different issue. You might want to help him but be too weak to assist his death. I am talking about a friend who refuses to help him and think he is doing the right thing. Why not assist?
Or perhaps a dreadfully lonely person who has lived half his life, all alone, and cold. He has no goals, he has nothing to aspire to. He just works everyday. And been doing that for most of his life. Does such a person really have a life? Not really. He is really a drone, in a way, for his employer, a personal machine for his boss. Say this person wants to end his life. Is it really so bad? How is suicide not the answer? Why should he continue to live through his terrible life until he dies?
Suicide is sometimes the answer.