Therefore, they have a great craving for love and acceptance. Then they flip back again. Kara, I am very much against the use of such labels. Suppose that as a teenager your Dad was, well, a naughty kid. He might have stolen a few cars, got intoxicated on alcohol and other drugs, and perhaps was part of a gang engaged in vandalism.
Many youngsters go through such a phase, and then grow out of it.
After this, he KNEW there was something basically wrong with him. He was faulty, and therefore there could be no hope for him. From what you say, he has in fact grown out of being a rebellious teenager, despite the labels. Let us hope so. If he were my Dad, I would not trust him, exactly.