It is an affirmative defense to prosecution based on paragraphs (2), (3), (4), (6) and (7) that the actor believed the accusation or secret to be true or the proposed official action justified and that his purpose was limited to compelling the other to behave in a way reasonably related to the circumstances which were the subject of the accusation, exposure or proposed official action, as by desisting from further misbehavior, making good a wrong done, or refraining from taking any action or responsibility for which the actor believes the other disqualified.
N.J.S. § 2C:13-5