Not a comment to you (because you are intentionally provocative and not reasonable) as much as it is an observation to those who genuinely think this way.
The people enslaved had their destiny determined once their tribe was captured by another. Forced labor was no longer an option for the enslaved. They could be a slave to the capturing tribe in Africa, a slave in the Caribbean, or a slave in the Americas. How are the people living in those regions currently comparable? Are the descendants of Africa better off in one of those locations or are their circumstances similar. Of course, this thinking doesn't justify deplorable acts. I can think of few things worse than having one's liberty denied.
If we could peer into the future 200 years, knowing that our present day life would be horrible no matter where we found ourselves, would we choose a place where our descendants would have the better prosperity? I would.