Which of the following best summarizes what Sire says about the core commitments of postmodernism? Which of the following best summarizes what Sire says about the core commitments of postmodernism? The core commitments of postmodernism are unstable and always in flux. The core commitment of postmodernism is concern for social justice. Postmodernism is by its nature contrary to core commitments, since it is nihilistic about values. The core commitment of postmodernism is concern for individual freedom of expression.