There is an old A.A. saying that I like: "Being them is punishment enough."
The saying is relevant when someone does something to you, and they seem to get away with it.
You have a choice: You can harbor ill will toward them, or you can forgive.
Ill will morphs from anger, to resentment, to bitterness. Bitterness poisons one's soul. It binds us, sours us, sickens us, paralyzes us, and imprisons us.
Forgiveness is a bitter alternative. Forgiveness doesn't mean they get away with it. It just means we turn their punishment over to the one who is called "the higher power" in A.A.
One punishment they will get for sure is that they will have to be them. Being them is punishment enough.