I don't think nationalism is alone holding the field it's in contention with a lot of different things.
A man filled with the love of God is not content with blessing his family alone but ranges through the whole world anxious to bless the whole human race.
Music should probably provide answers in terms of lyrical content and giving people a sense of togetherness and oneness as opposed to being alone in their thoughts and dilemmas or regrets or happiness or whatever.
There is no end of craving. Hence contentment alone is the best way to happiness. Therefore acquire contentment.
A man content to go to heaven alone will never go to heaven.
There's a tremendous difference between alone and lonely. You could be lonely in a group of people. I like being alone. I like eating by myself. I go home at night and just watch a movie or hang out with my dog. I have to exert myself and really say oh God I've got to see my friends 'cause I'm too content being by myself.
Men of age object too much consult too long adventure too little repent too soon and seldom drive business home to the full period but content themselves with a mediocrity of success.