Perhaps groupthink works.
M-W:
groupthink: a pattern of thought characterized by self-deception, forced manufacture of consent, and conformity to group values and ethics
The first paragraph from Wikipedia on groupthink:
Groupthink is a psychological phenomenon that occurs within a group of people in which the desire for harmony or conformity in the group results in an irrational or dysfunctional decision-making outcome. Group members try to minimize conflict and reach a consensus decision without critical evaluation of alternative viewpoints by actively suppressing dissenting viewpoints, and by isolating themselves from outside influences.
Note the differences between groupthink and doublethink. From M-W:
doublethink: a simultaneous belief in two contradictory ideas
The first paragraph from Wikipedia on doublethink:
Doublethink is the act of simultaneously accepting two mutually contradictory beliefs as correct, often in distinct social contexts. Doublethink is related to, but differs from, hypocrisy and neutrality. Also related is cognitive dissonance, in which contradictory beliefs cause conflict in one's mind. Doublethink is notable due to a lack of cognitive dissonance — thus the person is completely unaware of any conflict or contradiction.