Why should I be charitable to people that hurt me?

This video means a lot to me.  It explains how I felt and changed.  People ask how I could care for my adopting parents and abusers at the end of their lives with all they had done to and caused to be done to me.  As he says, I did not want to be them, I did not want to be like them, I did not want to replace them with myself.  I am not a religious person, and I have seen no sign of higher beings, but I agree it wouldn’t be bad to be like the Jesus he talks about and the way he treated others.   The question I never answered is did I forgive them?  Hugs