Almost all NPR stories that analyse race concern "black or brown" people. Why do you think that a disproportionate amount of content should be generated focusing on one issue? If my premise is correct, that more than 12% of NPR content contains racial analysis, I don't feel that the burden is on me to explain why I think this is an unjustified proportion. There are other interesting things to talk about in the world and time is limited. That's why. Why should one issue pre-empt others day in and day out?