Well I see what you mean, and if someone was being transported to a concentration camp where he will be tortured every day and later probably killed slowly in a cruel way then yeah, I could understand why someone would just kill himself. That would make sense.
But I don't get why would a sane person kill himself because their girlfriend left them, or because their business went bankrupt, or even because of something more serious like a prosecution that could lead to prison.
Yeah, its not easy, but nothing is over yet. You haven't lost yet. There is still a chance to do something great. After all, if you do end up going to prison, and its just to much for you and you cant bare it anymore, you can always kill yourself there once you are actually experiencing it. At least try. But I have friends in prison, and its not how most people imagine it. Unless you are a serial killer or something like that, you would not be put in level 3/4/5 prison anyway. Just saying.
So yeah, people can be really depressed and think that life is not worth living. However it is not an excuse to kill yourself. Its nothing but a delusion in your mind.
But then once again thats only my view. I am right in my eyes just as the person who commits suicide is right in his eyes. We could ask which one of us is more right. Each of us would have an opposite answer. What does this mean? It means that everything I said in this post is my opinion and not fact.