Montana had vigilantes too. They were organized committees of citizens who captured, tried, and hanged criminals. There are those who criticize their conduct and results but at the time Montana was unsafe territory where many suspected Sheriff Plummer of being in cahoots with the roadagente. He and many others were tried and executed.
No system of justice is perfect and where there is no system or a hopelessly inept or corrupt system then direct citizen action is undertaken to safeguard life and property. They do not function as well as a formal, honest system and therefore often commit their own crimes. But they make the bad guys think twice in places where ther is no law.
Having never lived in a truly lawless environment I find it hard to criticize people who take extereme measures to safeguard their community. The government needs to step up and do its job to stop this and this wouldn’t happen.