When novice music educators abandon their expressed dedication to forward-looking ideas like equity, epistemological distinctions between belief and knowledge, or lack of such distinctions, may influence such action. Political philosopher Russell Hardin argued that it makes sense for people to hold false, conflicting, and even extreme beliefs. Drawing on his work, we consider how social influences may encourage music educators to adopt a view of knowledge as the acquisition of information that is useful rather than truthful in the sense of being falsifiable and supported by evidence. First, we examine how teachers' everyday socialization may cause them to abandon practices associated with "music for all," an ill-defined ideal--officially adopted by the (US) National Association for Music Education--that we problematize here. Second, we consider the effects of broader polarization on socialized epistemology, including amplifying effects of technology, which may contribute to an in-group versus out-group mentality. Third, we investigate how advocacy related endeavors as well as bounded social circles in both K-12 music education and collegiate music teacher education may further solidify extreme beliefs within the profession. Finally, we consider implications for practice, including providing tools for more inclusive and open-minded advocacy efforts and some version of profession-wide "music for all" that focuses on socialization and recognition.