A growing number of frameworks for envisioning and enacting public relations posit social harmony as a core goal of the discipline. Such frameworks include two-way symmetry, communitarianism, fully functioning society theory, Isocratean rhetoric, and aspects of the reflective paradigm. A goal of social harmony, however, has been challenged as being overly idealistic, utopian, and incongruous with the competitive nature of human beings and organizations. This article examines the evolutionary biological theories of Charles Darwin and Peter Kropotkin -in particular, Kropotkin's theory of mutual aid -and details their conclusion that the processes of natural selection favor communities built upon cooperation rather than competition. The processes of evolution and natural selection thus provide a scientific foundation for a goal of social harmony within public relations frameworks.Public relations scholarship currently enjoys (a verb used advisedly) a sometimes contentious but ultimately beneficial state of flux regarding overarching paradigms that, ideally, suggest directions for scholarship and professional practice. The 'paradigm struggle' that Botan optimistically envisioned in 1993 now characterizes -and, in the estimation of Botan and Hazleton (2006), energizes -public relations scholarship:We would expect any field that fails to develop a paradigm struggle to stagnate and even to slip backwards. Public relations will be no exception to this rule either, so just as we should celebrate the emergence of a dominant paradigm in the field [symmetry/Excellence Theory], we should also celebrate the emergence of challenges to that paradigm … (2006: 9)