3 ideas
The trade in human body parts is sustained by buyers at the top, politicians who believe ritual use of the parts will secure wealth or office, not by marginal criminals. Victims are chosen from groups like sex workers because their disappearance triggers no official search. The violence flows downward, but the money and motive originate upward.
When the police are more likely to extort or detain vulnerable people than protect them, those people build their own protective structures. Examples include vetting clients, sharing warnings and having an organiser who can intervene. Amaka's network works as a shadow security service because the state has abandoned that function for the people it serves.
Read a city's night economy as a ledger of who is disposable. In the bars and streets after dark, politicians, police, clients and workers meet in one space but with radically unequal exposure to harm. The same transaction that is leisure for one party is mortal risk for another. That asymmetry shows the real hierarchy more clearly than daytime institutions do.