Jesus is concerned about our soul. Forgiveness is for our soul. The anger of someone wronging you can corrupt your soul to the point where you become the thing you hated. Which is one of the reasons you're ordered to forgive.

But to keep a rabid dog around you is contrary to wisdom. You can pity them and pray for them. But if their existence is a threat, their apologies are just temporary till they get back up, and they never changed you either remove them from you, or destroy them.