I agree, we should assume less ownership over our stated goals or stated beliefs. It doesn't matter who finds the correct answer, or an error, whatever the nature of the question. If someone points out that you probably don't believe what you believe you believe, or don't pursue a goal you believe (and told others) you pursue, this should be taken as a potentially valid concern, not a personal attack.

Although LW generally tolerates such questions better than people do on average, raising these questions still feels like an accusation, and even if the conversation doesn't derail, it rarely goes anywhere, for it takes genuine cooperation to figure out someone's thoughts in more detail.