Because a functioning healthcare system (either single payer or a more regulated public/private arrangement) is considered socialism/communism by enough voters and their Congressional reps, and so every actor in the healthcare system operates to maximize their profits, with the citizen healthcare consumer on the losing end. Most expensive OECD healthcare, worst outcomes, and people who cannot afford health insurance or expensive healthcare services die.
watched this doc a while back https://youtu.be/JHDkALRz5Rk?t=1458
this is America by the way but you could be tricked into thinking this is some 3rd world country with a NGO trying to give medical aid....
https://news.harvard.edu/gazette/story/2018/03/u-s-pays-more...
https://www.pgpf.org/blog/2020/07/how-does-the-us-healthcare...
https://www.brookings.edu/research/a-dozen-facts-about-the-e...
https://publichealth.jhu.edu/2019/us-health-care-spending-hi...