What is fear?
Fear stands for False Evidence Appeared Real. The Islamic Republic of Iran presents itself as a bad, mean wolf of the jungle by intimating people. Therefore, people become silent due to fear. Look at this nature video clip; only one impala did not fear a predator and survived. However, others are not so lucky because they fear their enemies.
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https://www.youtube.com/watch?v=Ghw7hr6KSA8