It's only by growing up in a county that does an amazing job that you end up with the stupid idea that countries are unemportent. Hint other people want your stuff and somebody needs to protect it.
PS: Some people where shocked that Greece defaulted ignoring. "Greece faced economic hardships and defaulted on its loans in 1826, 1843, 1860 and 1893." Why? Because as nation they can get away with it do why not?
Acknowledging that nations still have political, legal and economic significance is common sense and is not nationalism.
Worldview from some assumed national perspective = nationalism.
For example, viewing the entirety of the global internet in terms of the fact that certain other countries (that may be nominal enemies of 'your' (hah!) country) are connected to it.
PS: Some people where shocked that Greece defaulted ignoring. "Greece faced economic hardships and defaulted on its loans in 1826, 1843, 1860 and 1893." Why? Because as nation they can get away with it do why not?