What is Sassoon's angry about in the poem suicide in the trenches?

In the poem "Suicide in the Trenches" by Siegfried Sassoon, the poet expresses anger towards the brutal realities of war and the suffering of soldiers. He highlights the psychological trauma and despair experienced by troops, contrasting their grim experiences with the romanticized notions of heroism often portrayed by society. Sassoon's anger is directed not only at the horrors of war but also at the indifference of those who glorify it without understanding the true cost to human lives. Ultimately, he critiques the disconnect between the battlefield and civilian life.