Imprecation, curse, slander, and accusation is the primary role of the Enemy, the Satan, the Accuser. No believer will escape this relentless attack from the Evil One; for this reason we pray daily: “Deliver us from the evil one.”
Our recourse is to take refuge in the Lord who delivers us through the Cross. We come under the covering of the blood of Christ and overcome. God delivers the decisive blow of violent defeat over all enemies at the Empty Tomb.
Our prayer is that the Lord will save me by His mercy since he is ever faithful; he will save me, this poor man, from those that condemn my soul. The enemies who speak evil against me will be ashamed, that is, defeated, and covered with their own confusion.
This Psalm makes sense when we see verses 6-19 as a quotation of the curses of the enemy upon me, rather than my curses upon the enemy. Then the Lord will take up these curses and turn them back on the curser. Therefore, be careful: if I ask God to damn, that curse may come back; if I ask God to forgive, that blessing will return, I am forgiven.