I 100% agree with this in terms of its accuracy in describing the symptoms. And I do not think mental illness should be stigmatized any more than other illnesses should be (which is not at all).
The key though is that once mental illness occurs, rationality goes out the window. To a large extent causality goes out the window. You can't persuade a clinically depressed person to cheer up using a rational argument, the brain chemistry is going to overrule your rationality.
So my intent in my initial comment was to draw a distinction between Aaron's explainable behavior (that which was derived from his rational process) and his unexplainable behavior (that which was derived from his brain chemistry getting out of whack and his conclusion that taking his own life was a good decision).
I realize my sentiment ignores the possibility that the suicide was a direct and rational response to the prosecutors' tactics.