my theory is that its a consequence of losing the war. they have been shamed and dissalowed from being nationalists and even internallly in their society they are smacked on the head and ostracized if they express anything even marginally nationalist. being smart people, they hyper internalize the worldview that "nationalism is evil" and seek to export it all around europe - maybe part of it is a deep sense of "if i cant be proud of who i am then im gonna do everything i can to make sure none of u can be proud of ur countries either"
Canada