Once you have publicly committed yourself to a belief, there is a strong need to maintain consistency and even to convince others so there will be added proof that you were correct in your belief, according to the

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This behavior is explained by the cognitive dissonance theory, which suggests that people experience discomfort (dissonance) when they hold two or more contradictory beliefs, ideas, or values at the same time. To reduce this discomfort, people strive for consistency in their beliefs and attitudes, which can include convincing others to support their views, thereby validating their own beliefs.

Once You Have Publicly Committed Yourself to a Belief, There