This is an excerpt from Shaheed Mutahhari's book:
"You people who attend the majalis sessions imagine that you have no responsiblitiy in this regard, and think that it is only the speakers who are responsible. The people have two major responsiblities: The first is that of nahy 'anil-munkar (forbidding what is wrong) which is obligatory for all. When they find out and know-and most of the time they do know-that a narrative is untrue, they should not sit in that gathering. It is forbidden to sit in such gatherings and one must protest against them. Secondly, they must try to get rid of the eagerness and expectation which the hosts as well as the audience attending the majlis have for the majlis to become fervid, that there should be impassioned mourning and the majlis should get feverish with cries of the mourners."
"Everything is prone to certain hazards which are related to its nature. The Noble Prophet (s) said:
There are three hazards for religion: the scholar of evil conduct, the tyrannical leader (ruler), and the person who is diligent in practising religion but is ignorant. [3]
That is, there are three dangers for religion: 1) scholars who are evil and vicious in their conduct; 2) leaders who are tyrannical and unjust; 3) devout persons who are ignorant. The Prophet has considered them hazards for the faith. In the same way that plants and animals are affected by certain pests and diseases, and in the same way as the human body is prone to certain diseases and disorders, religion, creed and faith are also prone to certain dangers. Distortions of the faith, which are brought about by two out of the three categories of people mentioned by the Noble Prophet, that is, scholars of evil conduct and ignorant and sanctimonious persons, are a hazard for the faith and are destructive for religion. Corruption and distortion alter the content of a message of deliverance and the people who accept it as the truth derive an opposite result. "
Ayatollah Murtuza Mutahhari
'Ashura: Misrepresentations and Distortions'