If as a pro footballer you sign for a club, it is not beyond expectation that you will get a chance in the first team. I can see how not being given that chance has pissed him off.
Who has said that they have learned from their mistakes. I think you will find that people have said, IF they have learned, perhaps we should move on, for the good of the club.
Because I do not hold grudges. If someone is willing to learn by their mistakes, let them. Holding them in contempt will not gain the Rovers as a club anything. At least lets try everything to get the club back on track.