They get angry . Now, this is not a natural reaction. If I tell you a lie and you correct me, I will probably display embarrassment. If anyone's angry, it will be you. It is your failure to play the game that's making them angry.
All despotic societies have a state ideology of harmony, of unanimity, of perfect conformism.
Such questions are not permitted. Harmony must be asserted, whatever the cost in truth and freedom. The person who refuses to go along with the official line, however obviously mendacious, is creating disagreement. You can see the smiles wavering, hear the feet shuffling nervously under the table. Flatter the leaders, criticize yourself.