“Hatred.—The hatred of persons, institutions, and things which animated the men of the Revolution is one of these affective phenomena which are the more striking the more one studies their psychology. They detested, not only their enemies, but the members of their own party. ``If one were to accept unreservedly,'' said a recent writer, ``the judgments which they expressed of one another, we should have to conclude that they were all traitors and boasters, all incapable and corrupt, all assassins or tyrants.'' We know with what hatred, scarcely appeased by the death of their enemies, men persecuted the Girondists, Dantonists, Hebertists, Robespierrists, &c.
“One of the chief causes of this feeling resided in the fact that these furious sectaries, being apostles in possession of the absolute verity, were unable, like all believers, to tolerate the sight of infidels. A mystic or sentimental certitude is always accompanied by the need of forcing itself on others, is never convinced, and does not shrink from wholesale slaughter when it has the power to commit it. .../ Men who can put up with the greatest divergence of ideas cannot tolerate differences of belief.”*
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*Le Bon, Gustave. The Psychology of Revolution (p. 50-51). . Kindle Edition. (Bold emphasis added.)
Charles-Marie Gustave Le Bon (French: ... 7 May 1841 – 13 December 1931) was a leading French polymath [a person of encyclopedic learning] whose areas of interest included anthropology, psychology, sociology, medicine, invention, and physics. He is best known for his 1895 work The Crowd: A Study of the Popular Mind, which is considered one of the seminal works of crowd psychology. | From Wikipedia, the free encyclopedia | https://en.wikipedia.org/wiki/Gustave_Le_Bon