From Where Did Policing Go Wrong:
Police are trained to behave like occupiers, which is why they increasingly dress like they’ve been sent to clear houses in Mosul and treat random motorists like potential car-bombers – think of poor Philando Castile, shot seven times by a police officer who leaped backfiring in panic like he was being attacked by Freddy Krueger, instead of a calm, compliant, educated young man. Officers with histories of abuse complaints like Daniel Pantaleo and Derek Chauvin are kept on the force because senior officers value police who make numbers more than they fear outrage from residents in their districts. The incentives in this system are wrong in every direction.