The Dark Knight

So what would you do, would you take the overstep boundaries of the law, in order to serve justice where the law cannot?

Batman - Vigilante or Hero
The Boondock Saints
Etc.

Is it vigilantism or responsibility? Where do you draw the line? Is it too much power for one person or a group of people?

Al Capone, crime boss, was convicted on tax fraud.

When does personal justice against the tenets of the law turn into a call for anarchy? The Joker.

???