Humans are not geared for our "village" to be this big. The expansion of our sphere of "care" flies directly in the faces of thousands of years human evolution.

The "bubbles" we create, consume, and participate in are a subconscious attempt to slim down our giant "tribe" into something that our brains can manage. Of course these bubbles are readily aligned to people like ourselves - language, interest, appearance, culture, etc.

Expanding your bubble is hard. It takes work. As a result, most people don't.