When the Lord Jesus taught the Church to pray, he gave both positives and negatives for His kingdom work. We too, as we sing imprecations, and pray for the suppression of God's enemies, should remember that these songs are part of the corpus of inspired songs. I fear that many evangelicals have chosen not to sing these because they appear to be less-than-Christian. They do the Church a disfavor.
The hatred is there in the imprecatory psalms- festering, gloating, undisguised- and also we should be wicked if we in any way condoned or approved it, or, worse still, used it to justify similar passions in ourselves.
-CS Lewis, Reflections on the Psalms (New York: Hartcourt Brace Jovanovich, 1958), p. 22.