That metaphor of a few bad apples doesn't begin to get at the root of the problem. Police violence may be more like a poisoned water stream that pollutes the entire system. To argue that only a few bad cops cause police terror is like relegating racism to a few bigots. Bigots are surely a problem, but they are sustained by systems of belief and perception, by widely held stereotypes and social practice.
-- Michael Eric Dyson, Tears We Cannot Stop, p. 185