EDITORIAL - If you have to call 911 in an emergency you are typically glad when a policeman shows up. When someone smashes into your car you are happy for a policeman to show up and cite the driver of the car who smashed you. When someone has wrecked on the highway and the traffic is blocked for miles you are happy for the officer to show up and start the process of the traffic moving again.
Typically, you are glad to see a police car go through your neighborhood indicating the police are present. Often, the presence of the police is a deterrent to a would be criminal. When there is a domestic violence issue, an unruly person at a ballgame or gunshots heard down the street, you are normally glad for an officer to be on the scene to help resolve the problem.