Poking Counterfactual Holes in Covering Laws: Cognitive Styles and Historical Reasoning

W e report a series of studies of historical reasoning among professional observers of world politics. The correlational studies demonstrate that experts with strong theoretical commitments to a covering law and cognitive-stylistic preferences for explanatory closure are more likely to reject close-call counterfactuals that imply that “already explained” historical outcomes could easily have taken radically different forms. The experimental studies suggest that counterfactual reasoning is not totally theory-driven: Many experts are capable of surprising themselves when encouraged to imagine the implications of particular what-if scenarios. Yet, there is a downside to openness to historical contingency. The more effort experts allocate to exploring counterfactual worlds, the greater is the risk that they will assign too much subjective probability to too many scenarios. We close by defining good judgment as a reflective-equilibrium process of balancing the conflicting causal intuitions primed by complementary factual and counterfactual posings of historical questions.