Ps 2 7 I will proclaim the decree of the LORD :
He said to me, "You are my Son ;
today I have become your Father.
8 Ask of me,
and I will make the nations your inheritance,
the ends of the earth your possession.
9 You will rule them with an iron scepter ;
you will dash them to pieces like pottery."

Now listen the Psalmist is teaching that Gods law is eternal. He is pronouncing the death of anyone who opposes Gods law. He proclaims that anyone who opposes Gods law is going to face the wrath of God in eternity. But the Psalmist is also teaching a application that he practices throughout the Psalms. He is teaching that Christ who was equal with the Father in eternity , lowered Himself and took on flesh. We call this the incarnation. But He is teaching that Christ became the substitute who took on the curse of the law so that in becoming the curse He made the curse only enforcement of the law proving that He alone has the power over life and death.Christ became the only substitute that would save man from the pronouncement of death that rules in the curse.
But Christ also made man a high priest in a substitutionary role as Gods little gods on the earth to pronounce His judgement in the curse of the law. The Psalmist is borrowing Gods pronouncement in the law in the role of Christ kings that are established in the offspring of king David. So all of Gods elect are grafted into the ot Church and share in the same power on the earth as Christ obtained when He ascended to the throne. But these curses are contained in Gods judgements and not in mans anger. The curses cannot fail because they consume all the reasons for man to use His own anger to try to bring about the righteous of God.The curses contain all the destruction of the opposition and we are contained in the righteous indignation of God. The Psalmist calls this being protected in the refuge of God.
The Psalmist is saying that pronouncing the curses unite our anger with Gods just declaration of death to the opposition. So every pronouncement falls out into the potential for God to rush His judgement. He is saying that judgement is near and the curses provide the creation of swift punishment. When the curse is carried out by God in the time sequence then man is forced to give God respect. The curses are like putting a dog on a leash. Here in verse 12 the Psalmist teaches the power of the curses for Gods people as their refuge. " Kiss the Son, lest he be angry and you be destroyed in your way,for his wrath can flare up in a moment.Blessed are all who take refuge in him." The natural pressure is always pushing down on Gods opposition.