I played this game when I was a kid. Say I catch my brother with his hand in the cookie jar. I can do the same thing wrong and it can't nark. There is no higher ground. He's the same scum as me. If he told me I was wrong, I could just laugh at him. So because black people have sold black, they have no higher ground. None of this is going well. WE shouldn't have been hiding cookies but we did. WE did it, not our neighbors, not our future children. WE did it wrong.
Now we could argue that "this" black man did not sell slaves. But didn't "that" white man buy or sell them either?
We also have many white men who have ended slavery. Do you project responsibility for this on "this" white man? If we project the evil of the past onto the people of today, to be honest, we will also project the positive.
In the end, I am not responsible for my great-grandfather who steals cookies, who has slaves, who raises children, who cultivates or whatever the guy does. At most, if he had property, his heir could have it with related debts, such as a farm. In the end, this game is a joke. The sky is the limit of the games in projection, there are no borders. The logic does not lie on either side of the game.