Vigilante justice is when a government fails to uphold the social contract regarding rule of law and the citizens have to take it into their own hands. If a nation has to take vigilante justice into the wider zeitgeist, its a failed nation by and large. It's either two steps from anarchy, or clawing its way out of anarchy through tons of bloodshed.
Vigilante Justice should only occur when the Government of a Nation has begun to break down beneath the weight of its corruption, incompetence or impotency and lets evil run amok. It should be, as all forms of Justice, swift and brutal to set things aright once more. Preferably with the evil put in the ground and the incompetents ousted and forever besmirched.
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