Why did pacifists tend to oppose U.S. participation in the war?

Pacifists tended to oppose U.S. participation in the war due to their fundamental belief in nonviolence and the moral imperative to resolve conflicts through dialogue rather than armed conflict. They argued that war leads to suffering, destruction, and loss of life, and often perpetuates cycles of violence. Additionally, many pacifists viewed the war as driven by imperialistic motives rather than just causes, believing that involvement would ultimately exacerbate global tensions rather than promote peace.