Of course, taking advantage of reciprocation is one of the most powerful forms of manipulation, as described in Robert Caldini's great "self-defense" book "Influence". https://www.amazon.com/gp/product/B002BD2UUC/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
RE: Why a person in pursuit of rational behavior could choose to be "good"