In high controlling cults /dictatorships, its vitally important to suppress and control information that could weaken the authoritative position of the top leaders who have control over the subjective controlled subjects.
The leaders do this by selective propaganda to make an awareness of how good the controlled group are in comparison to people who are not of the identified group.
Religious cults like the JWS do the same thing.
ie ..... " We are the happiest people on earth "
" Salvation can only be obtained within are organization and the guidance and direction are leaders provide"
" We are in Jehovah god's chosen organization here on earth "