As a matter of fact, barbarism did break out after the flower had fallen from Neoplatonism.
War is the ultimate barbarism, the primitive belief that fighting determines who is right—but of course it doesn't.
Upon returning to his post, in 1859, the approaching presidential campaign of 1860 did not deter him from delivering a speech, entirely free from personal rancour, on " The Barbarism of Slavery " - to this day one of the most comprehensive and scathing indictments of American slavery ever presented.
It has been suggested that the fact of the conquest of the Amazons being assigned to the two famous heroes of Greek mythology, Heracles and Theseus - who in the tasks assigned to them were generally opposed to monsters and beings impossible in themselves, but possible as illustrations of permanent danger and damage, - shows that they were mythical illustrations of the dangers which beset the Greeks on the coasts of Asia Minor; rather perhaps, it may be intended to represent the conflict between the Greek culture of the colonies on the Euxine and the barbarism of the native inhabitants.
Similarly no one since civilization emerged from barbarism has ever really been willing to yield allegiance to a deity who is not moral in the fullest and highest sense of the word.