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Because you don't really need a war with mountains of dead bodies to have a successful country.
The whole point of EU was to get rid of national tribalism rather than reinforce it by some random "us vs them" mythology.
As someone who migrated from one country that was screwed up for centuries due to primitive nationalism to another country that just screwed up for the same reason, I can really appreciate the peaceful cooperation at the EU level without all that "excitement".