Facts, principles, and global justice: does the 'real world' matter?

The world is undeniably full of injustice. Many feel that much political philosophy is practically impotent and engaged instead in overly abstract theorising insufficiently sensitive to the realities of the world. One response to this concern is David Miller's influential model of evidence-based political philosophy, which claims to be sensitive to empirical evidence from the social sciences, takes seriously people's opinions, and defends the role of facts in grounding normative principles. Using various examples from the field of global justice, one of Miller's key areas of work, I show that Miller's method is unconvincing on two-levels. His theoretical argument for fact-dependence is flawed, and his practical argument for an opinion-sensitive political theory is either guilty of status quo bias or, in an attempt to escape it, becomes self-defeating. While the paper is primarily critical, I endeavour also to draw out the implications of my critiques for the role of the 'real world' in theorising.