Griffith's statements were only a "mistake" in that he said what he always felt outloud for all to hear, and truly exposed who he always was and the dogma that he came to infect his life with and spread it to others around him, if he could. It was not a "one time thing".
Rod Carew exemplifies a grace and wisdom that is truly inspiring. For me, the fact that he can teach us that grace and practice forgiveness and understanding regardless, is a lesson that I can aways take a refresher course in.
I think it's likely you are right but we don't know that for sure. I have heard the explanation that even though he didn't hold those beliefs he was making a very poor attempt at humor, saying what he thought would entertain the audience. It would be analogous to an actor playing a role of a character who is unlike the actor personally. I don't advocate for or against that point of view because I have no way to know, but this would be a way to explain how Carew viewed the man and how Carew was able to forgive him.