The US schools charge what they do because people are willing to pay it, even those from other countries. If China or Spain or England offer a better program at a cheaper cost, by all means go there.
And there are plenty of schools in the US that are as cheap as schools around the world, but they aren’t considered elite. People would rather pay more for what they consider a superior product.
I think medical schools will start offering free tuition like NYU does. The 60 Minutes piece explaining how and why they decided to do that was very interesting. The other elite med schools will do the same, and once Harvard does it the other Ivies will follow, then Duke and Stanford…slippery slope started by NYU.