The article shows, first, how Sociology has approached the concepts of “hope” and “war” and how throughout the history of the discipline these terms have gone from being neglected to arousing considerable interest. Second, the paper analyzes how and why avant-garde artists understood the First World War as a motif of utopian hope to annihilate a civilization in crisis and to transform it through its aesthetic formalization. Third, the essay tries to find out whether that hope was preserved over time or, on the contrary, was soon dissolved as a result of the drama of the events. It is shown here that the savagery of the fighting dissolved all European values of modernity and progress, including artistic ones. In fact, theoretical and stylistic conceptions, aesthetic categories, ethical postulates, and artists’ aspirations for conscience to rule the world were blurred. For the artistic avant-garde, utopian promises of a better world broke down. Consequently, this obliges sociologists to pay more attention to both phenomena—that of the war and that of the avant-garde—and to seek a more objective and critical interpretation of modernity, calling for its actualization, and of Sociology itself.