Why were writers disillusioned by World War 1?

Writers were disillusioned by World War I due to the brutal realities of trench warfare and the profound loss of life, which starkly contrasted with the romanticized notions of glory and heroism often associated with war. The widespread devastation and the perceived futility of the conflict led many authors to question established values and beliefs, prompting a sense of existential despair. This disillusionment is reflected in the literature of the period, which often critiques societal norms and explores themes of alienation and disillusionment, marking a significant shift in literary expression.