So someone who kills someone else due to mental illness is a vile human being that deserves a prison sentence, but someone who kills themselves due to mental illness is deserving of our sympathies and empathy.
You can't look at a rapist and say that he couldn't help it, his brain chemicals were jacked up and try as he may have, he finally succumbed to his temptations. So why are we fine to say that suicide victims couldn't help it, and that the chemical imbalance was to blame?
I know, I know, I haven't brought up Nazi Germany yet, but keep avoiding the question and I'm sure it will pop up.
Actually we can say that. That may just be a statement of fact. It in no way shape or form excuses that person from full responsibility for his actions, but it does explain them somewhat. The individual still owns the act, the outcome, and the consequences of the act.
The same applies in suicide imo. The difference to me is exactly what fish and GF have already outlined. Intent is part of every criminal trial. It is the difference between manslaughter and 1st degree murder, or no charge at all even with a death (tony stewart perhaps). The intent when you directly attack another individual is pretty clear, say taking your 8 year old niece into your basement and molesting or raping her, as is the outcome even if in some twisted way the person thinks they are doing the best thing for their 8 year old niece by raping her the damage to the other individual is undeniable.
But all that is far less clear with a suicide.
That has been the point I am trying to get across. I in no way condone Robin William's choice to end his life by suicide, and I agree it was a selfish act. However, the intent may not have been purely motivated by self-interest. I doubt you are going to find many sociopathic pedophiles who honestly believe what they were doing was in the best interest of the child they raped. Yet I think in more cases of suicide or attempted suicide you would find that is often the case.
Again, it doesn't condone it, I am not trying to get anyone to believe that suicide is a valid option (although it may be a topic of conversation we need to engage in...at what point is my life just purely mine to do with as I please and not a matter of law and legislation), but I think for the interests of treating this kind of mental health issue we need to understand it, recognize the motivations and mechanisms that drive someone to that, and open a dialogue if we are really going to make progress in this area. It is a social change we need regarding the prevailing attitudes toward depression and suicide, instead it is more often than not treated as the dirty little secret we don't ever dare discuss in "good company".
Understandably this is a very polarizing and difficult issue, as the pain it causes is very real, whether suicide is ever even attempted, but the stigma of mental health issues like depression are not helped in the tiniest little bit, and in fact are set back decades, with attitudes such as "let the ****er burn in hell for all I care, look what he did to his family" and "only estrogen-filled ******* would even consider that, grow up and be a man".