Actually, I think it's reasonable to say that if someone is so depressed, their responsible diminishes as the pain deepens. It's a terrible thing and if he was unwell he can't really be classed as responsible surely?

There have been a few people in my life who have committed suicide. Knowing what they went through, feeling it a lot myself, it often feels like the only way out, the only way it will bring an end to your pain. It's not true but it feels totally like that, like you have absolutely no option.