Simple Ideas Leading to Extreme Sentiments
Crowds are only cognizant of simple and extreme sentiments; the opinions, ideas, and beliefs suggested to them are accepted or rejected as a whole, and considered as absolute truths or as not less absolute errors. This is always the case with beliefs induced by a process of suggestion instead of engendered by reasoning. Every one is aware of the intolerance that accompanies religious beliefs, and of the despotic empire they exercise on men's minds.
Being in doubt as to what constitutes truth or error, and having, on the other hand, a clear notion of its strength, a crowd is as disposed to give authoritative effect to its inspirations as it is intolerant. An individual may accept contradiction and discussion; a crowd will never do so. At public meetings the slightest contradiction on the part of an orator is immediately received with howls of fury and violent invective, soon followed by blows, and expulsion should the orator stick to his point. Without the restraining presence of the representatives of authority the contradictor, indeed, would often be done to death.
Gustave Le Bon, in 'The Crowd'