A Justice Primer

If God is just and the Bible is his word, how is it that everyone is in such a fog when it comes to actually administrating justice? As a culture, we cry for mercy when we're hurt, and lustily pound the gavel when tables turn. Civil tyrants regularly trot out the thumbscrews and red-hot pokers, but just as many petty gunslingers take pleasure in targeting whoever "the big guy" happens to be. Is that justice?