One is united and integrated, where people enjoy each others food, culture and commerce. This Europe is a powerful force for good in the world where living standards, human rights and environmental sensitivity are on the rise. Then there is the other Europe where tribalism and economic nationalism brings fear, terror and lower living standards. This is the extreme in the Balkans. Openness is the surest way to overcome tribalism.
Open societies share their ideas and their culture.
I love my country, but I see no reason why I shouldn't also enjoy the best that other countries have to offer. It is great that Swedes eat Chinese food, watch American films, and read Latin American books. It is heartening that you celebrated when apartheid fell in South Africa and were horrified when people were butchered in Rwanda. All this does not make France less French or Scotland less Scottish. Openness does bring with it new challenges.