Revenge when the law fails

I know a lot of people have seen the movies and TV shows about a judicial system which gets it wrong and some Rogue vigilante tries to get Justice their own way.

But what does everyone feel about the ethics of this? If a law fails us especially within a corrupt system, would it be wrong to try to take revenge on someone if the laws don't protect the innocent and bad people keep getting away with doing bad things?

And what is worse, as we all know many personality types within people actually become more emboldened and empowered as long as they know they'll get away with it, often leading to severe escalation of the negative Acts.

If the law isn't on the innocent party's side, and the perpetuating party is the type that becomes emboldened without consequences to their harmful acts, and his actions get more egregious the longer they get away with harming people without consequences, the kind of people who live just to push boundaries to see how far they're allowed to go. And they push and push and push. And you just know they'll do worse to the next one because they did worse to you than the one before. At some point, isn't Revenge the only ethical choice?