The Universe is governed by law. From a galaxy with its billions of stars to an atom with its quarks and leptons – all move, behave, and react in accordance with laws which we may or may not fully understand. Justice is not only required, it is a given. Without it everything would be chaos.
There is no inherent mercy in the Universe. For mercy to exist, someone must take responsibility for every broken law and bear the consequences. But not just any being can pay such a price or has the power to make right all that was put amiss by the transgression of justice. It is only in the shelter and shadow of such an Infinite Intercessor that mercy, compassion, and forgiveness exist.