Have you people been to English class before. When you write a story/movie or essay it's usually directed toward a certain audience. Actually that is sometimes the first thing you think about when writing something. Just like Colin Collinsworths book is directed toward the sports crowd. Those are the people who will buy it. Not some grandma that watches the News all day everyday. It's race themed for the most part. Yes there are exceptions to every rule but for the most part everything has a theme or demographic it's looking to watch or buy it.
Just like white movies about white things are reaching for certain type of white people to watch them.