The card Justice means, well: justice. Thereto belong besides fairness also objectivity, dispassion, the ability to keep a clear, cool head, discernment and reason. For me it is escpecially important that Justice means the ability to discriminate between good and evil, right and wrong, and not to be shy of making these discriminations. Only those who can make them are truly responsible for themselves and for others. Justice also means to have a feeling for appropriateness, for balanced distribution. To be just means to want and actively boost a balanced distribution even if this means the loss of privileges for yourself.
The card is problematic where it stands for exaggerated black-and-white thinking, the non-tolerance of ambiguity, premature sentences and the missing of clemency.