Certain Psalms have been given the name Imprecatory Psalms...Imprecate means to pray evil against or to invoke a curse upon...Those Psalms that are Imprecatory Psalms are (Psalms 5, 10, 17, 35, 58, 59, 69, 70, 79, 83, 109, 129, 137, 140)...
These Psalms show the immediate feelings they have for the evil and wicked...So these Psalms remind us that there is evil in this world, and the Psalmists wrote against that evil with sometimes harsh words about them, in their defense of God and His people...