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.
Integral yoga
The fundamental cause of falsehood, error and evil is Ignorance. Ignorance is a self-limiting knowledge, which arises with exclusive concentration in a single field. According to Aurobindo, human notion of good, bad & evil are uncertain and relative.