It would be interesting to know how much of the EU’s attitude is directly derived from being an incumbent nation states club; which doesn’t tend to lead to successionist sympathies; and how much is a more idealistic(questions of whether noble or blinkered might be raised; but idealism of some flavor) strain derived from the idea that warm fuzzy progress in universal human rights and free movement and having official documentation in 23 languages ought to render successionist tendencies, which often have more than a bit of hyperlocal sectarian ethnic nationalism about them(albeit usually as the plucky underdog, so not as unsympathetic), obsolete and a bit atavistic.
