He realized now that to be afraid of this death he was staring at with animal terror meant to be afraid of life. Fear of dying justified a limitless attachment to what is alive in man. And all those who had not made the gestures necessary to live their lives, all those who feared and exalted impotence— they were afraid of death because of the sanction it gave to a life in which they had not been involved. They had not lived enough, never having lived at all. And death was a kind of gesture, forever withholding water from the traveler vainly seeking to slake his thirst. But for the others, it was the fatal and tender gesture that erases and denies, smiling at gratitude as at rebellion.

Soon after the event on 6 August 1945 he was one of the few French editors to publicly express opposition and disgust to the United States' dropping the atomic bomb in Hiroshima. His views contributed to the rise of the philosophy known as absurdism. To distinguish his ideas scholars sometimes refer to the Paradox of the Absurd when referring to "Camus's Absurd".

In an interview in 1945 Camus rejected any ideological associations: "No I am not an existentialist. Sartre and I are always surprised to see our names linked. In 1949 Camus founded the Group for International Liaisons within the Revolutionary Union Movement after his split with Garry Davis's Citizens of the World movement of which the surrealist André Breton was also a member.