You are assuming he feels the way today he did back in June of 2012. I am assuming he is 180 degrees the other way. He clearly stretched to keep the law in tact in 12 - I think now he’s so horrified at that outcome, that he’ll stretch the other way now. He naively thought the law was a good thing in 12. I think he’s embarrassed as hell about that now.
It’s not Roberts’ job to judge whether or not the law was good or bad. It was his job to judge whether or not the law was constitutional.
He had no right thinking the law was good or bad. His job is to decide if the law is in keeping with the Constitution. I don’t know what happens to people when they are given a black robe. Why on earth would they think their opinion matters in anything other than does the law keep faith with our founding documents.