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.
Our lives are more closely linked with those of others across the globe. When Russia defaulted in 1998, the financial aftershocks meant Mexican homeowners had to pay higher mortgage rates. When South Korea's economy seized up, workers in Korean factories in Britain lost their jobs. Undeniably, this causes pain. But people tend to forget that, thanks to globalisation, good times in the rest of the world spill over to us too.