The posited "conspiracy" has echoes of a redux of Marcusian paranoia actually. False consciousness here, there and everywhere. The sans culottes know not what they do, as mere pawns to the system. The thing is, is that I think certain cosseted elites actually believe this cant.
I, by no means, think what I stated is true - most of the time. It's also nothing exclusive to liberal democracies. In fact, I believe it's quite the opposite. It's nearly impossible in our society to completely cover up information. Administrations change so rapidly from a historical context that things remain rather porous, even if leaks don't seep immediately.