The euro is a political project. It is unification without sovereignty. It is the delegation of national sovereignty to groups of finance ministers and supranational bodies whose main task is to suppress the reappearance of the very source of their power.
The political institutions and practices that have grown up around the euro and the EU are based on the belief that exercises of sovereignty are dangerous, irresponsible, and unaccountable. Although these institutions are in one sense nothing more than the product of agreements between nations, their raison d’être is to prevent any further, outright expression of that sovereign power. That is why they insist on total subjection to their decisions, and why Greece became about more than Greece.