uyhtgrfed
To get back on track, Orwell (in this passage and throughout the entire book, really) is basically dramatizing fundamental means of understanding the past, and the effect this has on how the future is imagined. Yes, it is about dogma, but no, the enforcement of dogma does not necessarily have to be as institutional or intentional as you seem to be suggesting. A fundamental aspect of social existence is that understanding the past draws heavily on our assumptions in the present, which in turn are drawn from how we view the past. Our understanding of the past shapes how we reify the world around us, which in turn influences how we imagine future possibilities.
See [double hermenutic](https://en.wikipedia.org/wiki/Double_hermeneutic), [reflexivity](https://en.wikipedia.org/wiki/Reflexivity_(social_theory)) and [postmodernism](https://en.wikipedia.org/wiki/Postmodernism) (please actually read about what postmodernism is, rather than relying on popular understanding of the term, which is very often inaccurate)