Can a liberal polity act on pressing matters of public concern in a way that respects the variety of beliefs and commitments that its citizens hold? Recent efforts to answer this question typically begin by seeking an uncontroversial starting point from which legitimate public ends can be said to follow. This reluctance to admit controversial beliefs as legitimate grounds for public action threatens to prevent us from responding effectively to many of the leading social and political challenges that we face.

Eric MacGilvray argues that we should shift our attention away from the...