I think one of the reasons people lose sight of that is because they look back and see all those products, all that improvement in quality of life that capitalism brought us. Those things are undeniable. But one can't infer from this that the system will forever be awesome. It was aligned with human goals initially, but as time goes by, it's less and less aligned.
Market capitalization does not indicate importance to the human race, though it's easy to lose sight of that.