Earlier quoted context omitted.
I’d take a step deeper and realize that this is glorified tribalism that’s stuck in humans. We evolved into a civilized species but the idea of territorial tribalism is embedded deep into our very psyche.
Yeah, but it can be fought. I was never a nationalist, but I didn't realize how ingrained a lot of habits are until I started traveling through Europe. I've once read that "weirdoes start 10 miles from home" - well, it's not that bad but it's still amazing to realize that yes, people in different countries are still people.
Tribalism is very active and impossible to get rid of in my view unless something totally disruptive happens (Alien invasion at which point we will engage in interplanetary tribalism).