It's a lot easier to blame a defendants suicide on his mental state than on your prosecution.
Aarons parents are under no obligation to acknowledge their sons mental state because he has acknowledged so himself in lots of places. That does not mean that this absolves everybody else from blame.
He may well have done so, but it comes across as disingenuous to mention one very pertinent detail (a /highly/ aggressive prosecution), and leave out another (chronic depression going on for many years).
No-one is saying anyone is absolved of 'blame' or being a factor in Aaron's decision.
Aarons parents are under no obligation to acknowledge their sons mental state because he has acknowledged so himself in lots of places. That does not mean that this absolves everybody else from blame.