Forgiveness is not an excuse to be weak when it comes to justice. As you forgive and reduce your anger, try to exercise justice from that context. In other words, with reduced anger, ask what is fair. If you do not forgive and then forge ahead with a quest for justice, you might ask for too much because of your anger. In other words, when you forgive you may end up with an even better quest for justice than would have been the case without forgiveness.