We do not need armed representatives of the state to have a peaceful country. Cop training is designed to create violence and escalate. Cops are tasked with jobs they are not qualified for, like interacting with disabled people. Cops are violent, cops are slave catchers, cops are used to stop social revolution and to jail/kill political dissidents. They murder, pillage, rape, and justify their violence as "needed" as if violence has ever solved the problem of "crime". Crime is only a symptom of the system, and cops exist to mask those symptoms from the consciousness of the machine. Their "necessity" is far oversold. Any number of more specific and useful specialized jobs could be created to fill the role of cops. Fun fact: on average (between the states) cops only get 500 hrs of training (before they get to shoot civilians).

Still think the cops can be "fixed" by simple policy change (which requires ignoring the systematic issues with the police)? In 2005, the supreme court made a landmark ruling that boils down to "the police do not need to enforce the law, we leave it up to their own judgment" (read more: Town of Castle Rock v. Gonzales.