The job of the police is to enforce laws. Whether this helps you is ancillary.
Policing means arbitrating in a dispute even when no laws have been broken, helping those in our community incapable of helping themselves (accident victims, people whose meds are off). It doesn't really mean the regular use of violent force or even the threat of an immediate death penalty to gain compliance with a personally conveyed order. Tht's not justice and it's arguably not even law enforcement.