This is a corollary to Steve Fuller's observation
Public ignorance thus ascends to the meta-level of not knowing the expert system in which the relevant expertise is contained.
It's worse than that, of course - the system that has the goods is something you used to understand, but don't anymore, and thus you are ignorant about the very expertise that you once had.
-- 30 --
Noted previously in a post on The Blogger's Secret.