These people don’t have any idea what “vigilantism” really is, but if they get their desire and defund the police, they are going to find out.
Just finished reading some books on the history of the Old West. One chapter read of a group of rancher vigilantes catching a pair of horse thieves in the act. They hung them on the spot and left them there with a pick and shovel on the ground below in case someone wanted to bury them.