To speak of the truth, no one actually wants justice. When they speak of justice they speak of decisions in favor of themselves. Humanity has selfish hard-coded into their genes; they just simply can't let go. 

Some ask whether pure justice be brought into reality or not. However they fail to ask the right question; does justice exist? We all know there is no black and white, we all know that there is no absolute evil and absolute good.  Not a single thing is black or white; they simply just are in fifty shades of gray. In these gray areas we cannot truly determine which one is darker; we just assume it is. 

Long story short there is no justice.