Who do you put the responsibility on generally?
Here is my initial thoughts:
1. Before trying to think about the general trend of the matter, we must note that Some of the most heinous criminals in the world have committed suicide, where Hitler is the first one who may comes into your mind..
2. Criminals who used to kill other may find it easier to kill themselves than those who would not even kill an animal.
3. Suicide is a crime against those who surround you, starting from those who depends on you and those who deal with you assuming that you will not kill yourself tomorrow!
So the one who kills himself is not always a victim, however, it may be the case that most of those who kills themselves are victims who can't stand the criminality of the others..So they deserve our sympathy..
From a religious point of view, a believing person must accept the trials he faces in this life, understand the philosophy behind these trials and must always invoke his lord who will certainly deliver his servants..