I agree with Cerejota. Given their propensity for ratings-motivated sensationalism caution is necessary when adopting the language used by the media. The term "vigilante" is commonly loaded with negative baggage, including high degrees of unlawfulness and vengeance. Perhaps some more moderate language is appropriate for the main article, such as "organised resistance" or "people who have banded together for mutual protection". That said, www.thefreedictionary.com defines "vigilante" as: "One who takes or advocates the taking of law enforcement into one's own hands.", which does seem appropriate in the present context. Evidently, this issue is not clear-cut.  Talk