"Let them be ashamed and brought to mutual confusion who rejoice at my hurt; let them be clothed with shame and dishonor who exalt themselves against me."
Regenerate churchmen may offer this prayer, though it is highly politically-incorrect, and it might (wrongly) be construed as self-serving. Those who are "on the Lord's side" are not perfect--but that is not the issue. The situation David faced (above), and which we face even today, is this: we are attacked by those who seek to destroy the gospel and the church, (even by those who might claim the name of Christ).
Are you a believer in Jesus? Then, take up your sword and shield. Be hard on your own sins; but don't let this cause you to be too easy on God's enemies.
[Puritan quote of the day: "Nothing is so certain as that which is certain after doubts." --Richard Sibbes, in "The Bruised Reed"]