Agree that fixing problems after the fact is NOT proactive, but it's the only thing you can do once the problem has surfaced, especially if you were not there when the problem occurred. Once new management steps in, the ONLY thing they can do is fix it after the fact. They obviously cannot go back in time.
As for the know it alls, I think they are gone.
Everyone has to decide for themselves, but if they are taking the steps to make PA a better experience I have no problem giving them a second chance.
To each his own.