There are crimes that are committed, but no one is around to call the police. Police patrol is in place in many municipalities to try and catch criminals in the act.
It's also well-known that generally criminals don't commit crimes when there are police nearby. The patrolman driving or walking down the street can act as a pretty good deterrent and keep people from committing the crimes in the first place.
It's also well-known that generally criminals don't commit crimes when there are police nearby. The patrolman driving or walking down the street can act as a pretty good deterrent and keep people from committing the crimes in the first place.