You obviously never been to Chicago or dealt with the Illinois State Police.
Or California, or Idaho, or Wyoming, or New York... :)
I reckon there are jerk cops in big cities and there are friendly cops in big cities, and there are jerk cops in small towns and there are friendly cops in small towns. All depends probably not just on the cop, but your own attitude, mode of dress, regional accent, etc.
No matter where you go, there you are.