Modification of the opinions of members of a group to align with what they believe is the group consensus is called Groupthink.
What is Groupthink?
Groupthink is a phenomenon that occurs when a group of well-intentioned people makes irrational or non-optimal decisions spurred by the urge to conform or the belief that dissent is impossible. The problematic or premature consensus that is characteristic of groupthink may be fueled by a particular agenda—or it may be due to group members valuing harmony and coherence above critical thought.
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