Does the life of Andrew Carnegie support or counter the philosophy of social darwinism?

The super rich of the industrial era sought monopolies, where they could have complete dominance of an industry without any competition. They thus believed that the marketplace works in similar ways to that of nature, where only the fittest survive and those unable to compete become extinct. In this way, they were "Social Darwinists", and Andrew Carnegie's monopoly of the steel industry was no exception.