It's a weird two-front war where people tend to answer the social question and ignore the economic one, but the economic question has not done any favors to the EU or the US for that matter
Self-isolation (whether a nation or a person) is not a good solution to hypothetical bad actors. Society is built on cooperation and trust
And the opposite case is also a quick way to degenerate cases: if Canada devalued cooperation, what is the argument for provinces to not do the same? And thus it would only fuel Quebec and Alberta separatism.
You already see it with Brexit which is clearly opening further "us-vs-them" outlooks in Scotland, Wales and Northern Ireland.
Ah, no who am I kidding. These usually worry about the opposite. What if EU manages to resist to those projects and remains liberal democracies?
But I don't think you can just elect Hitler in every nation and then get them to cooperate. They will inevitably want more and when they do they become aggressive. At which point I guess people will reconsider.
Smells like a long-term attempt to break the EU from within TBH.
Who are the adversaries?
That is a strange take.