A couple of things to follow up with - St. Paul to the Ephesians 4:26 says "be angry, but do not sin". The Catechism talks in 1767-1770 about how anger is a PASSION, and how the passions are neither good outright nor evil outright, it depends on how they are directed and what they are directed at. So justice and charity REQUIRE that I be angry about a priest committing a crime against a child, and, hopefully even more obvious, if I knew about, my anger should direct me to intervene in accordance with the law. Both Saint Paul and the Catechism make it CRYSTAL clear that anger towards evil and injustice is necessary and virtuous and required. Every Catholic word, including "anger" has lots of nuance.
Also, I found a helpful article from Jimmy Akin, and he points toward an encyclical from St. John Paul II called Dives Misericordia, where we read: "the requirement of forgiveness does not cancel out the objective requirements of justice...in no passage of the Gospel message does forgiveness mean indulgence toward evil, toward scandals, toward injury or insult. In any case, reparation for evil and scandal, compensation for injury, and satisfaction for insult are conditions for forgiveness"