If a city or town lacks an adequate police department, the residents may assert their Second Amendment rights. A historical example of a "peace patrol" that actually worked was the gunfight at the First National Bank in Northfield, Minnesota, September 7, 1876. Jesse and Frank James joined the Cole Younger gang to rob the First National Bank of Northfield, Minnesota. While the crime was in progress, the piece-loving residents of Northfield showed up with their pieces. The bandits, outgunned and outmanned, knew they had to "git". Before they "got" they shot the banker because he didn't get the safe open and left two bandits and one other resident of Northfield lying dead in the street as they high-tailed it out of town with the Northfield residents in hot pursuit. The James brothers split from the rest of the gang and escaped while the rest of the bandits were either captured or killed. That was the end of the Cole Younger gang.
