Pluralistic ignorance
In social psychology, pluralistic ignorance is a situation in which a majority of group members privately reject a norm, but go along with it because they incorrectly assume that most others accept it. This is also described as "no one believes, but everyone thinks that everyone believes". In short, pluralistic ignorance is a bias about a social group, held by the members of that social group.
Obscurantism
Obscurantism ( and ) is the practice of deliberately presenting information in an imprecise and recondite manner, often designed to forestall further inquiry and understanding. There are two historical and intellectual denotations of "Obscurantism": (1) the deliberate restriction of knowledge—opposition to disseminating knowledge; and, (2) deliberate obscurity—an abstruse style (as in literature and art) characterized by deliberate vagueness.