You are on to something. We debate this ourselves because some feel more strongly than others one way or the other. It does seem that somewhere back in the early days, "Bible Students" were free to disagree with certain things and as time went on, there was less tolerance for that.
I don't think that everyone among the presidents of Watchtower to the Governing Body all got up every morning and said they were ready for another day of mind-controlling the members. But when the writers of the strange doctrines said that God "spirit-directs" them (leaving room for error as compared to "inspires") they have to kind of insist that members go along without questioning it.
To me, the biggest factor in Watchtower going further and further down the path of dangerous mind-control was some kind of paranoia that members could not be trusted and would not do the right thing unless they were told what that right thing was. That, and always always always putting the preservation of the organization ahead of anything that might benefit individuals has gotten them where they are today.