I'm a Brit who has lived in the US for over 10 years. The employer-provided healthcare was fought for by the labor unions and made sense at the time. The trouble is, it became too profitable and now it's difficult to change because the big insurers have lots of money to pay lobbyists.
But much as I despise Trump - this is actually not his doing, he's just along for the ride because it sticks it to Obama. It is the GOP who are trying to destroy the ACA, has been ever since it was passed. They have tried to undermine it and had some success alas.
Other posters above have said this, but yes there are people out there who would rather die in a ditch than offer help to poor people of color. It's weird to us, but if you grew up here, you'd have been saturated with the myths of freedom and independence that are supposedly at the root of this country. It's the same reason we can't get gun control, despite the murders every day, despite the slaughter of young children in their classrooms.
So, when you suggest that universal healthcare should be a right, many people lose their minds, because in their heads it means government interference in their lives. The mantra of small government is so pervasive, even Democrats struggle to argue that sometimes a little government intervention is needed.
When I talk to people who feel this way, I always want to ask them if they have visited countries like Somalia. Definitely small government there. But I don't say it because I don't know who is carrying a gun and if they are the kind of nut to shoot a woman who doesn't agree with them. I live in a red state. It's a thing.