God who judges the earth

Psalm 58:1-11
David prayed to God who judges the earth.
Kings indeed do not decree what is right.
Let them vanish like water that runs away; when he aims his arrows, let them be blunted.
The righteous will rejoice when he sees the vengeance;
Mankind will say, "Surely there is a reward for the righteous; surely there is a God who judges on earth."
Why?
Whole world if full of deceit and violence. Those wocked will be revenged by the God.
Surely there is a reward for the righteous, and there is a God who judges on earth. God is the sovereign Lord over the earth.
How?
Fear the Lord for He is a living God, who watches everyone from heaven.