People usually try to retaliate on the other if they have unreasonably suffered by that person. But God doesn't want His children to pay evil for evil but to overcome evil with goodness. They should not judge others by themselves but leave the matter to God who is the only Judge. When we suffer unfair treatment, we should leave everything to God who knows everything and do good. This is the true way to win.
"But if your enemy is hungry, feed him, and if he is thirsty, give him a drink; for in so doing you will heap burning coals on his head." (Romans 12:20)