I get the sense that him being the "good son" and the one who is not a problem was drilled into him for a LONG time. He was breaking down and tried to deal with everything on his own.
In his essays he was VERY arrogant.
Even his mom admits in her book that she doesn't understand why he was let out early.
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"And you know, you know, you know, this can be beautiful, you say you're numb inside, but I can't agree. So the world's unfair, keep it locked out there. In here it's beautiful."