There is Black slavery all over the world. Today, not 200 years ago. Mostly in Muslim countries and mostly by other Blacks. There is a massive slave market all over Asia. Again, that is today, not 200 years ago.
Why aren't all these Black protesters protesting Boko Haram? They have just abducted 1000 young Black girls into slavery over the last year. And Boko Haram is Black. And they will sell these girls all over the world.
Why not protest Boko Haram, the biggest slave traders in the world?
Why is it that I, as a non-Black, more concerned about Black slavery all over the world, than American Black people are?
I guess there is no payoff in that. They don't care about slavery. They care about the money. Nothing more to it than that.