Unfortunately that’ just human nature, tribalism, nature is cruel and the life that evolved out of it is the product of this cruelty

There are many social circles. The most immediate is Family, then extended relatives, close friends, then neighbors, then your village/towm/city, then region, then nation, then its the planet.

Humans aren’t really capable of really caring about thing happeneing far away.

This isn’t unique to the US. I think every country is like that, especially those struggling.

It’s not like people consciously choose to be evil, this is just biology, they can’t help it.

When your family is struggling, its hard to care about neighors, and especially harder to care about someone in another town/city.

Nationalism just extend the circle a bit, people care about their own country’s suffering more than others. Don’t even have the time to catch a break and think when your role in this system is just a wage slave.