They aren't allowed to read information critical of the org.
They blindly follow the dictates of a small group of men. They used to follow individuals (Rutherford, F Franz). In the seventies, hundreds of thousands of JWs went to book studies and considered publications written by F Franz. He was their oracle, their guru. That was extremely cultish. Now, his material is forgotten, and the org is trying to hide it. New JWs don't even know who he was.
They are kept busy in a routine that leaves them little time to question the org.
Their meetings only allow for agreeing with and praising the org. Consider the Watchtower study. There are no questions allowed and all comments are supposed to be in agreement with the printed material.
They are allowed to become weak in faith in their supposed creator, but not in faith in the org/GB.