It is easy to render evil for evil, giving others "what they deserve." But we are called to do good even when other men don't. And often, God will use a godly example in the midst of those who do evil to win them to Him. We should not be overcome by and conformed to evil but by doing good, we should fight it and defeat it.
Lord God Almighty, there is no evil that can overcome us while Your grace defends us, there is no evil we cannot conquer and defeat when Your grace goes with us. We know that whoever is born of God overcomes the world. We who know Your name are the true "overcomers," but only because You first overcame the world and then sent us Your Spirit to empower us.