Heard on the Ken Hamblin show (no, I don't have any links yet):
A psychologist specializing in teen suicides considered the Osama binLaden note to be a red herring, an attention-getter, not a "real" note.
Two classes of suicidal teens: those who are abandoned and lacking of normal social contact, and those who have a sudden irrational rage that leads them to commit suicide to "punish" their parents or other previously loved ones.
This guy's parents have vanished down a foxhole somewhere; we can't tell if this was an indulged but ignored guy.
Likewise, we can't yet say if he might have been jilted by a girlfriend.
But either possibility does fit the pattern as described by this psychologist.
Meanwhile there's a cry for "more safety more safety" which will undoubtedly get general aviation snared in more rules and regulations that wouldn't have prevented this incident anyway.