The simplicity and exaggeration of the sentiments of crowds have for result that a throng knows neither doubt nor uncertainty. Like women, it goes at once to extremes. A suspicion transforms itself as soon as announced into incontrovertible evidence. A commencement of antipathy or disapprobation, which in the case of an isolated individual would not gain strength, becomes at once furious hatred in the case of an individual in a crowd.
The violence of the feelings of crowds is also increased, especially in heterogeneous crowds, by the absence of all sense of responsibility. The certainty of impunity, a certainty the stronger as the crowd is more numerous, and the notion of a considerable momentary force due to number, make possible in the case of crowds sentiments and acts impossible for the isolated individual. In crowds the foolish, ignorant, and envious persons are freed from the sense of their insignificance and powerlessness, and are possessed instead by the notion of brutal and temporary but immense strength.
Unfortunately, this tendency of crowds towards exaggeration is often brought to bear upon bad sentiments. These sentiments are atavistic residuum of the instincts of the primitive man, which the fear of punishment obliges the isolated and responsible individual to curb. Thus it is that crowds are so easily led into the worst excesses.

Gustave Le Bon, in 'The Crowd'

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