Recently, thanks to an assassination/murder, the issues about US healthcare have been in the news again. Before 2010, I could boast that the NHS was so much better than the US system. Thanks to fourteen years of the Conservative's running it into the ground, I cannot be as proud of it as I would like. But, it still is more equitable than the US system and you do not see people trying to assassinate Wes Streeting over it.
Obama had wanted to make things much better, but US politics diluted the reforms that he wanted. One thing that would have worked was the mandate to obtain insurance, but that was removed and the US healthcare system did not improve the way it was meant to. The mandate was actually the idea of Hilary Clinton, but it made so much sense, Obama changed his mind on it and took it on with his proposed plan. It has worked in many nations to ensure that insurance coverage is universal and affordable. But since the GOP got rid of the mandate, costs have risen as hospitals have to pay for the increasing numbers of Americans who are not covered by insurance.
So when the United Healthcare CEO is murdered over the issues with US healthcare, he is not at fault for the system. The fault with the system lies with the politicians who ruined Obamacare.
As seen in The Rainmaker and the series, Breaking Bad, there are advantages to universal healthcare which the US misses out on...