Rum, years ago I wondered about the same, and believe I know where you are coming from. I really hope I don’t come off rude with my post, but have to ask:
Are you really sure you want to dive back into this topic, and are you really, really sure you want to do it with that question?
The thing is that this question has been (and still is) asked a million times, and there is no quick answer to this that will satisfy. I know I had the same thought in the past, and it took many years for me to understand it. I’m trying to educate myself with reading articles, listening to podcasts and talk to people who know more about this, and I still only scratch the surface.
My quick answer would be that the case of the Bosco recasting is not racial discrimination, since reverse racism doesn't exist.
And I am certain that this statement, standing on it's own, will ruffle a lot of feathers, but that’s because you have to know a ton of background infos and facts that support this claim. And I think asking a video game forum to deliver these is a lot to ask. Also, it has been explained a million times online, so I would ask you to do a bit of googlin’ to find out yourself.
Again, I am happy that you are curious about the topic and want to learn from it, but kindly ask you to do a bit more self education and research. Because you have to understand that, to many people, these questions are extremely exhausting. Too often it feels like having to explain and discuss the rules of soccer before every single match.