I'm not sure they are intentionally excluded. I don't think I would have found the book if I wasn't actively reading books by women of color. So much of the media is dominated by white men or white women, they are less likely to read books on uncomfortable topics unless they intentionally seek them out.

Hopefully, we are shifting to a more inclusive media, but it will take intentional action by individuals or corporations to get there. Much of what drives corporations and the media is hot-button issues that often fade away over time. To make lasting change we as individuals need to speak up to let the people in power know what we expect.