It is all about trust. People make their decisions based on information they are given. If they are given false information they will unwittingly make the wrong decisions. Those who deliberately give out propaganda containing false information, are responsible for the mistakes they cause other to make.
We expect it to be safe to proceed through a green traffic light. If the traffic control system is faulty, the result can be tragic. The Watchtower Society had abused the trust of its membership. Then again it is to be expected. It is what all politicians and would be world leader do.