The threat to cultural coherence that I am talking about is not from without, but from within (through immigration).

Yes, part of the issue and you are already seeing the backslash, Danemark, France, Netherlands. That's also a horse the PP will ride hard to go back to power in Spain. Also, Europe = Schengen.

Acculturation by European institutions played no role in my comment. Also, I was not the one who clamored for a supranational democratic institution.

Europe does play a big role because it allows a lot of things to escape the reach of national (democratic) policies. Making it worst, it's often to simply nullify politics (and leave the issues in private hands), not to assume responsability itself.

Also, I was not the one who clamored for a supranational democratic institution.

Eh oh Migeru, be honest! You were the one who doubted the importance of the nation-state. Tsk tsk tsk :>

I'll close on that. I'm running late on my work :(