Let's take a look at Jesus' example of suffering for righteousness' sake.
We must return good for evil, even when it seems like we'd be letting evil win.
1 Peter 2:21–25
For to this you have been called, because Christ also suffered for you, leaving you an example, so that you might follow in his steps. 22 He committed no sin, neither was deceit found in his mouth. 23 When he was reviled, he did not revile in return; when he suffered, he did not threaten, but continued entrusting himself to him who judges justly. 24 He himself bore our sins in his body on the tree, that we might die to sin and live to righteousness. By his wounds you have been healed. 25 For you were straying like sheep, but have now returned to the Shepherd and Overseer of your souls.