The smart way to keep people passive and obedient is to strictly limit the spectrum of acceptable opinion, but allow very lively debate within that spectrum—even encourage the more critical and dissident views. That gives people the sense that there's free thinking going on, while all the time the presuppositions of the system are being reinforced by the limits put on the range of the debate.
Controversy may rage as long as it adheres to the presuppositions that define the consensus of elites, and it should furthermore be encouraged within these bounds, thus helping to establish these doctrines as the very condition of thinkable thought while reinforcing the belief that freedom reigns.
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