Imprecatory Psalms are imprecations against
God's enemies.
God is glorified in restraining, conquering and judging his enemies. Thus, to sing the imprecatory Psalms is glorifying to God. It also glorifies God when we remember that we are numbered among the most worthy objects of the imprecations, and that is only by God's grace and mercy that he has dealt so mercifully with us in making us his friends.