"Why is US healthcare so expensive ?"
Extreme corruption throughout the whole US business, economic, medical, Big-Pharma, FDA, EPA, Big-Insurance-co's involved in the $$-250-trillion-$$ derivatives trading $cheme-$cam !
"The whole system is corrupt"
Because the whole system, top-bottom is completely-totally corrupted !
That is different from totally corrupt, Corrupted means that key elements are corrupt not every element.
But the net-effect is "totally-corrupt" in-on the key-aspects of the whole system.
Rendering the US-healthcare and all US-Govt, US-business related systems, for all practical purposes "totally-Corrupt" !