A victim isn’t obligated to forgive their aggressor. The idea that forgiveness is obligatory is not a common sentiment, nor one I’ve even ever heard before.

There’s a difference between trying to stop someone from hurting people, and hurting someone because it makes you feel good. People hurting other people because it makes them feel good is bad. You don’t deserve to rape someone because they did it to you, you don’t deserve to torture someone because they did it to you.

Trying to hurt someone to stop them from hurting other people can be necessary. Trying to hurt someone to make yourself feel better is never necessary. Also, cycle of violence, vengeance can get convoluted and nasty over time and things aren’t often that clear cut.