I think you need to consider the immense capability of humans for self-deceit, false logic and just think and act driven by emotion and then post-hoc using thinking to fit some explanation for it.

Also there are way more people who never learned to think in a structured way than there are people who have, plus even the former can be subtly sawed by their own wants, needs and fears (it mostly happen at the level of interpreting things with many possible interpretations and our judgment of the likelihood of various explanations where there are various possibilities, in my experience).

My point being that you can't really "read" them as thinking things through and then knowingly choosing to deceive: I think that at least the ones who just parrot that stuff do not at all internally operate like that.