There can never be justification whatever in taking one's life. Life as we were made to understand that it's a gift. So therefore, nobody has the absolute power to take his/her life except the giver of the life, which is God. Imagine that you were given a precious gift by your parents. Would you destroy that gift or you're going to jealousy protect it? Undoubtedly, you're not only going to protect that gift but also preserve it as antiquity for years. Relate that with your life which was given to you by your God.
Now, you would see that, it's completely sacrilegious for anybody to take his/her life. I know some would say that they have good reasons to commit suicide, perhaps due to the untold suffering they are battling with. But in spite of the misery they are facing presently, there is still hope if only they could lift up their eyes to see that is always light at the end of the tunnel.
Apparently, committing suicide in order to escape one's fate is an act of cowardice. Instead of comtemplating suicide, why not focus that same thought on believing that there's nothing too big for your God to do.