Why is doublethink so important to Insoc?

Doublethink is crucial to Ingsoc (English Socialism) because it enables the Party to manipulate and control reality by allowing citizens to accept contradictory beliefs simultaneously. This mental flexibility helps maintain the Party's power, as it prevents individuals from questioning the regime's Propaganda or recognizing its inconsistencies. By fostering a population that can accept two opposing ideas, the Party ensures loyalty and suppresses dissent, ultimately reinforcing its authoritarian control over society.