Is Justice Good?

Our very first assignment of the semester for Moral Values was to define "justice." I'm sure probably half of the class is referring to that for this assignment, but for the sake of definitions let's refer to the Republic. Plato defined justice as a virtue for the person, and doing one's own job for society. So even Plato somewhat defines justice as a moral if it is seen as a virtue that makes a person's soul live in harmony. Biblically speaking, justice doesn't make a lot of sense. God is the only One who can define justice for what it really is while Christians spend the rest of our lives trying to show more mercy than acting "just" in the world's eyes. In White Bear  justice is portrayed in a way that I think Polemarchus would agree with. He defined justice as basically giving to each person what they deserved. You owe your friends good and your enemies bad and that applies just as much to society at large as it does the individual. The "White Bear Justice Park" is taking this idea and applying it on a social level. The main character suffers a punishment society has deemed fair based on her crime. Day after day she experiences the agony and misery of the punishment. Is it too extreme? If justice is, indeed, a virtue and is therefore good in it's attempt to bring harmony to one's soul, is the justice in  White Bear doing that? Is it good? It might be what is owed, but that would almost make justice and evil punishing a greater evil. It's like in Dante's Inferno when the different layers of hell are characterized by the people who occupy it. They are placed on a certain level based on their crime and then suffer those consequences day after day for eternity. Since each "show" in White Bear is different based on the criminal, I assume that it is a lot like Dante's Inferno. Is that producing good, though? Is justice truly, purely good if it requires doing evil acts against a greater evil? I've read the Republic so many times that I've absorbed Plato's definition of justice and don't really hold one of my own. But I agree with his definition because I do believe justice, and actually knowing what justice is, requires virtue--it is a virtue. It produces goodness and harmony. White Bear does not look like justice.