Perhaps being able to share and vocalise his thoughts, it's helped JN to deal with what he was subjected to and the effects that had on him, with the added benefit of being able to help others be more mentally prepared for that eventuality, and enlighten an even larger audience to what can go on.
Not that it really means much in the scheme of things, but, he has my respect for talking about being a PoW just as much as I respect others' desire to not talk about it.