Triumphalism

But not only did Soviet triumphalism eventually provoke the Reaganite reaction in the United States, but, Kissinger suggests, it produced the overextension of Soviet resources that led directly to economic and ultimately political collapse.

Source: wiktionary

A better understanding of science should lead not to triumphalism but to the kind of humility recently expressed by Nobel Prize-winning geneticist Francois Jacob in Of Flies, Mice and Men: "Science cannot answer all questions. . . . It can, however, give some indications, exclude certain hypotheses. Engaging in the pursuit of science may help us make fewer mistakes.”

Source: wiktionary

One reason why triumphalism about the fall of the Taliban should be eschewed is because the US and its allies have shown insufficient regret and sadness at the deaths of Afghan villagers. This has allowed the propagandists of Islamic nihilism to claim that the US cares about the deaths of civilians in New York but not in Afghanistan.

Source: wiktionary

Yet in addition to being self-defeating, sectarian triumphalism undermines core Jewish values of common peoplehood and mutual bonds between Jews worldwide.

Source: wiktionary