We can bare in mind that the Doublethink that afflicts the rest of Oceana also afflicts the Inner Party. And, that makes sense. Just switch out Ingsoc for something like today's Christianized Objectivism.

But, in terms of a safety-per-resource-spent ratio, this is massively inefficient compared to something else, like, say, Democracy.

In both cases, the method relies upon, and therefore demands some level of paranoia.