I think there is a cultural factor to consider...in the majority Catholic and mainstream population there is probably going to be no loss of sleep over dirtbags of many stripes being disappeared...the taste for violent actions against petty misdomeanors is likely going to backfire on vigilantes and could put a target on themselves. In all such cases though there will be outliers, the choice as always is which way to be biased?
Power corrupts. When humans don't have a system of laws, and a procedure seen as "fair" for dealing with bad actors, things can and probably will spiral out of control culturally ( as the United States has) The more acceptance there is for vigilante justice, the less respect there will be for rule of law justice. If you feel you have been wrongs, why go to all of that hassle with a legal system you don't trust, when you can put a call into the vigilante friend of your brother in law and have the score settled? Family members are always more credible than some schmuck they accused of stealing, or raping, or drug dealing. Vigilante groups largely do not have comprehensive investigative units nor do they hold investigative trials to determine guilt.
This sort of justice will corrupt all cultures, catholic or whatever.. If the vigilante groups become the defacto enforcers they become the defacto law. That power will likely corrupt the men who started out getting rid of the worst of the worst. IN fact most honorable men who started the movement or group will quietly quit when they have accomplished what they set out to do, and leave it to lesser men to do the smaller cleaning up and maintenance. During this phase the defacto power of the body doing the enforcing will attract its own bad apples.
If this happens for a short time and then stops when the worst of the worst are gone, then all fine and good. But I wouldn't say that was the normal or typical course that can be observed in history, and once established it can be very difficult to stop. A Robespierre always seems to find his way to the top of such an organization, and then starts using its power to rule by fear - all for a better world and the common good of course.