As best stated in the title, the song is about seeking revenge and justice for a crime committed. When the criminal gets a sentence unfitting for his crime, they are empowered to take matters into their own hands when the justice system had failed in locking them up. The main protagonist is driven by a sense of justice and the need to right the wrongs that have been done to the victims of the criminal he sees as nothing but a plague on the world (a parasite in society). In the end, he has no qualms about snuffing out his life, unknowingly committing an evil crime that he feels to be a lesser evil; To eliminate a criminal may be seen as acceptable righteously, but not so morally.
As best stated in the title, the song is about seeking revenge and justice for a crime committed. When the criminal gets a sentence unfitting for his crime, they are empowered to take matters into their own hands when the justice system had failed in locking them up. The main protagonist is driven by a sense of justice and the need to right the wrongs that have been done to the victims of the criminal he sees as nothing but a plague on the world (a parasite in society). In the end, he has no qualms about snuffing out his life, unknowingly committing an evil crime that he feels to be a lesser evil; To eliminate a criminal may be seen as acceptable righteously, but not so morally.