In his essay, "Secular Humanism and politics: an unapologetically liberal perspective," Pigliucci makes an important point about the aim of political humanism
Secular humanists realize that humans are a kind of animal, partly conditioned by its biological evolution. We also recognize the power of cultural change and of rational thinking. We should therefore use these crucial starting points to engage in public discourse for the betterment of humankind, whenever possible, and regardless of whoever is sitting on the other side of the aisle. It is the humanistic thing to do.