One takes advantage of the opportunity to have been right before everyone else.
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The case must be clearly stated, shouting is dangerous. Explain the situation to your entourage. Avoid any brutality, do not turn away.
In the making
Give pointers to the student who asks oneself questions, but delay before answering to the thoughtless questions. That way the student will rely on their judgment.
Proof (Pivot's method)
It is imprudent to avoid questions when one doesn't want to be embarrassed.
One has come to seek evidence to be right about those who do not wish to take the risk of a confrontation.