When we watch the news on television or read it in a newspaper, We may think that the unjust are winning and the just are losing. We get the same idea when we read Psalm 82. But this Psalm also says that God is part of the judicial system. The Psalmist believed that God will one day make everything right (v.8).
Yes, there is going to be injustice in this world until Jesus comes. But when the King of kings is reigning and the Lord of lords is supremely in control, we finally will have justice in this world.
In spite of the worlds injustice, God is in control, and He sees all that happens. Until Jesus comes to reign, we must live here. In the meantime, trust Him, obey Him and do His will.