I just wanted to say that I understand why some people do it. My brother suffered from schizophrenia - he was an incredibly nice and giving person who kept on hurting people due to his disease. I understand why he took his own life and I don't fault him for it. Of course I am incredibly sad about it and wish I could have done so much more, but 20 years of intense suffering wears on a person.
We don't know the exact details behind Aaron's decision. A significant percent of the people who knew Stephen, even those who knew him well, didn't know about his diagnosis either. It's impossible to draw any more conclusion than "he was suffering and couldn't bear the burden anymore". My condolences to his family, I truly know what they are going through and it's absolutely shit.