The most fundamental social right is to refuse a personal contract. Manipulation requires to hide a part of that contract, therefore to deprive one's right to refuse that part (by ignorance). The fact that most of us manipulate others is an irrevelant ad populum, and good intentions are not justice, obviously. Novels manipulate readers, but it's a visible part of the tacit contract.. it's self-manipulation. About childs (and adults), there's not such a contract as long as they can't understand its nature. But manipulating them can eventually impede their moral development, thus violating the (disputable) right to develop their natural potential.
Written by "IDontThinkSo"