As Gramsci would well have understood the dominant intellectuals within the academy and policy apparatus have worked very hard to restore white racism in all kinds of guises. Privilege is hard to give up. More honest intellectuals have suffered continued marginalization in the academy and in the policy arena since they do not give the Master what the master wishes to hear. That is false - white Americans benefited as a nation. But that argument is legally irrelevant.
Governments make restitution to victims as a group or class.
David Horowitz plays politics. Slavery Is a Bad Idea and Racist Too. It's a non-issue. You don't even hear Al Sharpton carping about it. The answer is, he's not.