To anger be built, the situation at hand must be, at least from the perspective of the "victim", really bad.
You don't go over a psychopath, or a violent person and ask for forgiveness. Chances are you put your life at risk and they will "play you" all over again.
Yes, two adult persons, healthy ones, can forgive and be forgiven over a conversation. Redemption does not need an agressor to ask for forgiveness, he can simply just change behaviour.
Unfortunately there are some people in this world that damage other people's life, forever. The act of forgiveness is essential to have a better life. That does not mean excuse or forget what has been wrongly done.