I'm sorry if my too neutral language made you interpret my comment as an endorsement of the view I was describing. It isn't , it is my description of the views of others.

I myself deplore that kind of black-and-white, throw-out-the-baby-with-the-bathwater view, and agree with your last paragraph.

But is the view of many that because nationalism taken to extremes has been  to blame for some atrocities, all nationalism should now be condemned, and we should now have open borders, encourage mass transfer of populations, multicultural societies, etc.; that states should not in any way attempt to  reflect or protect the identity and values (i.e. "culture") of its majority population, but even fight such attempts; and of course, no right to "self-determination", not even in the form of decentralised federalism.

The notion of French-English "founding nations" has been successfully superseded by multiculturalism thanks to Trudeau père, and francophones reduced to just another minority.