Gullibility manifests itself in a variety of ways. Succumbing to pressure to do something in which you do not believe and then continuing to stay that course is it’s own kind of gullibility: the false belief that we must do something we don’t believe in and/or conform to a way of life we don’t want.
Each of us has the power of choice, even when we believed we didn’t.
Again, I am very well aware of the complex and often sophisticated psychological methods of manipulation that cults use to control their members, but that wasn’t the explicit question asked in the OP.
Minimus, I’ve noticed that you often create threads on a wide variety of topics that ask for simplistic answers to complex questions. Then, you and others, will take exception to many of the simple, direct answers. This thread is definitely one of those as I noted in my initial response.
It often feels like you are baiting forum members for an argument rather than inviting us to a genuine discussion.