The parents still do not get it. The "indulgent attitude" they have displayed his entire life is the base cause of all this. As a child, he had as permissive an upbringing as anyone could have. He was a seriously screwed up kid. As a result, he searched for and affiliated himself with what is arguably the least permissive group with the least permissive lifestyle on earth.
I do not think that John Walker Lindh actually hates America. He hates his parents.