I think people are advocating that he reflect on his beliefs, come to a different conclusion than he's held, and then apologize for his past views.
It doesn't seem like he is going that route.
While 'peer pressure' is seen as a negative, if you think yourself right while everyone else is wrong on an issue it is a pretty good indicator that you should check your assumptions and logic carefully.
I think people are advocating that he reflect on his beliefs, come to a different conclusion than he's held, and then apologize for his past views.
It doesn't seem like he is going that route.