In the eyes of anyone who has been the recipient of injustice, in order for God to be a good God He must also be a God of justice. If there is not a point at which God judges injustice from justice He is either deficient in power, or unwilling to right wrongs and so cruel. Why is there injustice if God is all powerful and good? Because God loves us and His love gave us a way out, a way of repentance, of being reconciled to Him. He gave us time (our lives here on Earth) to make a choice between receiving judgment for our injustice and receiving Jesus’s sacrifice for our sins. He paid the price we could not to right the scales of injustice and invites us daily into receiving grace that we could never earn. God is the final yardstick, the only one with both the power, and the position to judge rightly and He has, in His mercy and love, given us the choice of living in our injustice and sin or receiving the salvation and grace that His Son Jesus made available to us.
We are called to love each other, even our enemies. How can you do that if you are focused on exacting revenge from them? You cannot. God is kind in that He provides a way for anyone to be saved from what they deserve through repentance and acceptance of what Jesus accomplished on the cross. It is our responsibility to offer the same opportunity of salvation to those who practice injustice as God offers us when we practice it. We must remember that in His eyes all sin is deserving of death. Sin is injustice, it represents an unbalancing of the scales of right and wrong.
It is your position to extend the same grace and love that you have received to others and to let God judge injustice. I guarantee that God’s judgment (and His ability to carry it out on an eternal scale) is far more just than any punishment or revenge you could enact. This isn’t to say in any way that you should tolerate injustice, but rather that you are called to do everything in love, not from a spirit of revenge and judgment.