Could they have assisted in helping him grow? Yes but I don't see how or why it's their responsibility to rehabilitate him.
This kid has had, from all accounts, his parents, other family members, past coaches, school administrations, and peers that should/could have been there to help him if he needed it. When it comes out that he's yet to apologize to his victim personally and his work in charity is court-mandated, this doesn't scream somebody who is remorseful or willing to learn.
He had four years to improve things and didn't. More recently, he had draft interviews where he could have owned up to his behaviour and had a discussion where he could have demonstrated how/why he was learning and didn't.
Maybe, the emphasis should be on him to be proactive in his learning and not on everybody else.