And while the planning authority will constantly have to decide issues on merits about which there exist no definite moral rules, it will have to justify its decisions to the
people-or, at least, have somehow to make the people believe that they are the right decisions. Although those responsible for a decision may have been guided by no more than prejudice, some guiding principle will have to be stated publicly if the community is not merely passively to submit but actively to support the measure. The need to rationalise the likes and dislikes which, for lack of anything else, must guide the planner in many of his decisions, and the necessity of stating his reasons in a form in which they will appeal to as many people as possible, will force him to construct theories, i.e. assertions about the connections between facts, which then become an integral part of the governing doctrine. This process of creating a “myth” to justify his action need not be conscious.