The author gross says that he and his compatriots were forced to help do all this. The idea of making everybody wait exactly 15 minutes for the next act to happen is "diabolical" But what you're seeing here is a transition from sheer, hot blooded revenge into something more stable: an attempts to control all this.
The Atlantic Slave Trade mixes centuries of human bondage with violence, economics, commerce, geo-political competition, liberty, morality, injustice, revolution, tragedy and bloody reckonings. That sounds like a lot, yet this show merely scratches the surface of this enormous subject.