Is philosophy of migration biased by methodological nationalism?

These days, methodological nationalism is finally sparking a heated debate in philosophy. A flurry of new papers has recently been published in open access: Baycan, 2026; Beaton, 2026; Milioni, 2024; Sager, 2021; Ujlaki, 2026. Naturally, some of them question the relevance of the critique of methodological nationalism to political philosophy. As I myself argued that nationalism is a cognitive bias (that is, a factor that systematically distorts judgements), let me explain why I believe it is a cognitive bias that heavily affects the ethics of migration. There is a simple method to detect and weigh bias in philosophical debates about justice (Dumitru, 2023). It has three steps: Identify the principles of justice that philosophers frequently discuss or teach, whether they support or reject them. Examine how the principles are discussed with regard to different social groups (e.g., women, immigrants) Interpret the results: a) If philosophers discuss various groups in roughly the same way…