Seems the moral here is that humans already have a common internal mechanism for overturning belief systems that has nothing to do with rationality: outlining it completely would take me more research and probably enough space for a top-level post (it hasn't been addressed directly as far as I can tell), but it's related to the cult attractor and you can see suggestions of how it works in conditions like Stockholm syndrome.

Being a lot more common over the set of all humans than having accurate intuitive access to a truly rational procedure for deciding between elements of belief systems, it makes sense to consider it a more likely cause for your own decisions in the absence of evidence for such a decision procedure.