Not at all. The problem is that police, like any other government official, are susceptible to corruption once they become sufficiently insulated from any repercussions.

Town elects a sheriff. Sheriff has a couple marshals. Can round up a posse. Life is pretty good because at the end of the day, Sheriff still needs the town and town needs the sheriff.

Capitol city has their own police with their own special jurisdiction that couldn't give fewer fucks about the populace making a bunch of noise disturbing the ruling class. Did they get too aggressive? Arrest the wrong people? Capitol police investigated themselves and cleared themselves of any wrongdoing.