Yes I get it, you believe in personally bringing harm to both inmate and guards by forcing guards to perpetuate human rights abuses upon the inmates. So why is there no vigilante Justice in countries with rehabilitative prison systems, if it’s just so inevitable? Is it possible that your myopic view of humanity is tainted by a ethnocentric perspective? Because most victims of most crimes aren’t frothing at the mouth for punishment. They want JUSTICE, as you said. Justice and Punishment are not the same. Nor does our system provide Justice for victims, in nearly any case.
If your concern is Justice, then you should learn of Restorative Justice models, and how they function.