People need to meet their most basic needs, doesn’t have to be through money. We’ve just set up society to work that way.
Capitalism in particular, is an incredibly stubborn idea that’s difficult to throw away. And we’ve rigged the system to make it difficult (almost impossible) to give up.
Hell, the U.S. is notorious for trying to overthrow governments around the world who don’t subscribe to capitalism, and the U.S. governments way of thinking.