If people didn't choose their birth place nor their parents why do people feel proud or ashamed of their country? Why do they feel somehow responsible for the actions people take in the present or took in the past even centuries ago just because they were born in the same place on they political map as they did?
Where does this need to worship a flag, an anthem, an army, historical figures, sports teams, etc. come from? Is there a political interest in indoctrinating people with nationalism? If so, how ethical is that? Is it about tribalism and humans as evolved social animals still need to belong to some form of group? Can humanity evolve to something better? Is Nationalism a way to find a purpose in life as Nietzsche would say or maybe is it about being part of something bigger than yourself that will remain after you die?
I'm looking for authors that explore these questions.
"Nationalism is an infantile disease, it is the measles of mankind" Albert Einstein