Discouraging members from expressing disagreements
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Rationale: Competition with other groups enhances solidarity, and competition within a group destroys it, so discouraging competition with other groups and encouraging competition within the group are the opposite of solidarity-enhancing.
Discouraging members from expressing disagreements would lead to 'group think': inability to confront problems, lack of criticism of poor decisions, false consensus. It may create high solidarity, but not healthy solidarity.
