Comment by redm

Nationalism is an extension of tribalism which is inherited in human beings, it's in our DNA [1]. We, as a species, may override our instincts to do what we feel is better for humanity, but then again humanity is just a larger tribe.

[1] https://www.psychologytoday.com/us/blog/life-is-trip/201208/...

[2] https://www.psychologytoday.com/us/blog/our-emotional-footpr...