Notice that this person has a very limited awareness and acts totally consistent with his or her limited skills and ability. Now notice that if this person was wiser and more aware, then he or she would be able to act very differently, but the person isn't wiser and more aware. This person only has the limited awareness that he or she has. Notice how much this person suffers as a result of his or her limited equipment. Remember that forgiveness is for you, not the other person.
Forgiveness is a choice.
Let go of your resentment and get on with your life.