Im doing a project on parents lying to their children. To what extent is Pinocchio parenting acceptable?

Many parents teach their children that lying is a really bad thing, especially lying to parents. Turns out that a lot of parents are hypocrites and regularly lie to their children in order to influence their behavior and emotions. Parenting by lying ranges from telling tall tales (about the tooth fairy, for example), to fibbing ("Tommy, what a beautiful drawing!"), to manipulation in order to change the child's behavior.