Can you be specific?
Theoretically, a person raped and murdered your whole family, stole most of what you owned, and was not persecuted because of a lapse in legal procedure.
You've since recovered and are living a good enough life. You find this person getting beat up by a large gang of people. Would you help this person and get his wounds treated, knowing what he did to you? Would you still care for this person despite his evil actions and tendencies?