This is an excellent movie with a brilliant message.
The tragedy of it is that racists watch it and find themselves agreeing with the things Derek says before prison. How stupid do they have to be to watch a movie calling on people to drop racism, and only take more racism away from it? Such art is wasted on the ignorant...
I bet there are a few people that would feel that way but if that does happen it is just like a line in the movie "He's gone, we can't help him."