Well done, I completely agree with Dale on that.
Americans have spent several recent weeks in a vengeful fury over the acquittal of Casey Anthony, who partied for an entire month while her 2-year-old daughter, Caylee, was supposedly missing but might have actually been murdered — by Ms. Anthony. Many believe that Caylee was denied justice; her mother, meanwhile, has been released from prison and remains hidden in an undisclosed location, largely to protect her
from vigilante justice.
The inadequacy of legal justice is one thing, its outright failure is quite another. But in both cases the attraction of a nonlegal alternative is a powerful one. Are these vengeful feelings morally appropriate? The answer is yes — because the actual difference between vengeance and justice is not as great as people think.
As the three former defendants walk out of the courthouse, discussing ways to Kick the Dog, shots ring out. Three bodies fall to the steps.
The police look around but the killer is nowhere to be seen. The Vigilante Man has struck again.
The Vigilante Man is a man who brings criminals to justice - by any means necessary* Even if it mean killing the criminals outright. Although he is breaking the law, he is presented as the good guy. If the police are after him, expect them to secretly sympathize with his goals.
Dirty Harry is on the trail of vigilante cops who are not above going beyond the law to kill the city's undesirables.
A New York City architect becomes a one-man vigilante squad after his wife is murdered by street punks in which he randomly goes out and kills would-be muggers on the mean streets after dark.
In some other contexts, "avenger" could be use as a synomym for one that seeks justice in his own terms, I would say. As in:
"In art and culture, everyone roots for the avenger (o vingador, o justiceiro), and audiences will settle for nothing less than a proper payback "
I think that "the executioner/revenge seeker/avenger would fit in certain contexts as well, but not always.
Still on the subject, the film genre where someone carries out rough justice is "revenge movies". In most of them the main character have the perception of justice having not being deserved, or some guy have walked away et cetera.
Ah, not to be confused with vigilant.