Ps 2 4 The One enthroned in heaven laughs;
the Lord scoffs at them.
5 Then he rebukes them in his anger
and terrifies them in his wrath, saying,
6 "I have installed my King
on Zion, my holy hill."

This Psalm is teaching that there is only One Ruler over the all governments and kingdoms. This Ruler can not be thwarted. He has created all things according to His law. This law speaks at all times. The law is carried out in the voice of blessing and cursing. You see here that it is described as God rebuking wayward kings. This means that at all times God is speaking life and death according to His pure justice. When the law curses sinners it cries out in voice of rebuke. In other words Gods response to the wicked is the only stable foundation of His sovereign success. When we see the terrible attempt of the wicked to break Gods chains the curse cries out death to the wicked. In these pronouncements we are taught this sure foundation.
In the curses are Gods scoffing at the wicked. We all are taught that we must always be positive and loving. But God does not love without pure justice. In other words in every government we find that the law that is carried out protects the innocent. It is the same love for Gods defense that we find in this legitimate scoffing. We are saved by Gods pronouncements from believing in a cheap love.