It's human nature to wake up in the morning and worry a lot more about your kids, your wife, your family than about somebody 10 miles away.
Selfishness is not popular. In the Soviet Union, if you said you were selfish, they would make you feel horrible about it. But that's how we function.
Elon Musk didn't build SpaceX and Tesla to better society. That's the second- or third-order effect. He built them because of his own drive.
Adam Smith said it's not out of benevolence that the baker makes his goods. It's out of self-interest.
The beauty of capitalism is that everybody wakes up in the morning, makes very selfish decisions, and in making those decisions, they benefit the whole.