Would it help if we could compare it to something physically painful like diabetes or crohn's or cancer? He wasn't selfish. He was unable to beat this because it's more than willpower and life circumstances. I've been there. My mom succeeded when I was 19. I've been over this for 25 years. Sometimes our medicine and therapy just can't beat this. We don't say of those who stop treatment of cancer after so long that they were selfish. This is a lot like that. If you don't know, I would urge you to look into it the way I had to. Calling us selfish or cowardly is really unhelpful.
Let me be perfectly clear: it isn't a moral issue. Neither brave nor cowardly. It's just an illness that makes your brain malfunction to such a degree that you take your life. The entire premise that any disease is due to moral failing is so deeply rooted in our culture that I know it's hard to step away from it. It's even more intense when it comes to suicide. I'd like to live in a world where all illness is seen for what it is, including the ones in the brain that we don't understand very well.