Although most of the political activists who drew inspiration from On the Beach were leftists, the author, Nevil Shute, counted himself as a friend of low taxes [and] entrepreneurship, and an enemy of socialism. Born on January 17, 1899 in London, Shute had a successful career as an aircraft engineer. He played an important role in the early development of airships and later founded his own aircraft construction company.I doubt anyone would ever say that about Stanley Kramer.
As a businessman and successful novelist, Shute understood the destructive impact of statism and high taxes on creativity. Several years after World War II, he fled to Australia because of his disgust with the policies of the Labour party. As the author of the introduction to one of his works wrote, Shute, "saw all the original acts of the Labour Government as stultifying to the initiative, designed to stifle the kind of technological creativeness he represented, designed to level down to mediocrity by legislation, rather than to elevate to freedom and better living by adventure and competition."
For more on Shute's politics, including an argument that he was more "a man of the establishment" than any sort of libertarian, see these interesting follow-up comments from Andrew D. Todd.