Comment by glenstein

Right and to your point, I would say you can distinguish (1) "objective" in the sense of relying on mind-independent data from (2) absolute knowledge, which treats subjects like closed conversations. And you can make similar caveats for "rational".

You can be rational and objective about a given topic without it meaning that the conversation is closed, or that all knowledge has been found. So I'm certainly not a fan of cult dynamics, but I think it's easy to throw an unfair charge at these groups, that their interest in the topic necessitates an absolutist disposition.