Animals are highly self-interested.

People are also self-interested. People make a circle around himself.

A family member is also self-interested ,they make a circle around his family.

A community member is also self-interested.

And you will become patriotic when you make a circle not around the family but the country.

But when you approach the level of Buddha consciousness.Where no more horizon.you don’t identify with yourself with any family or country but humanity.