Callahan shows no remorse. Callahan either believes or has certainly given the impression that he believes that he is doing everything right, and there is no need for him to change his ways. He has been recalcitrant throughout his entire tenure at UNL. There's no comparison between the two situations whatsoever.
Why should he show "remorse"? He's not obligated to say that his whole system and method of coaching are wrong when he fails. He's said many times that he is responsible for the product out on the field, and that he is extremely disappointed and hurt by how the season has turned out. What more do you want? "I am a terrible coach and I resign?" He's not going to say that, nor should he. He's still going to believe in what he teaches, and he's going to continue coaching to the best of his ability, which I really think he is doing.
I'm not standing up for the job he's done. I just think it's wrong for everybody to act like Bill Callahan has done a terrible thing for which he needs to apologize.