One important thing about forgiveness is inner peace. In your second scenario, there is a very high possibility that these people don't even care if you will forgive them. Why did I say that? Some might release their mistake and come to ask for your forgiveness, while others will just move on, not minding how you feel about them. But for peace of mind, you must forgive them, whether they ask for it or not.
Yes, forgiving people is more about us than about them. You do it for you regardless of whether the person deserves it or not. Thanks for your contribution.
You're welcome friend