The problem with this comment is that it misunderstands what the issue is. I’m not talking about everything that relates to racism. I’m just talking about the subjective response of categorical mistrust that arises when someone lives a life that is constantly exposed to racism. In order to know about that, it’s not enough to just know the facts about racial injustice. You have to know what it is like to be black in America. Consequently the only primary source is, as you say,” first person accounts from members of the identity group.” The rest of us can think about those first person accounts, but they are the primary source.