I'm the downvotee. I think they understand economics. Who doesn't? What they refuse to admit is:
1) Healthcare is a limited resource, like anything else.
2) Prevention, which few if any "leaders" highlight, is a viable alternative to healthcare price increases.
Are there there some nefarious undercurrents? Yes, of course. But to blame all our ills - and remove diet, lifestyle, etc. - on ever increasing demand only makes the current system stronger. People who believe they have no control aren't part of the solution.
That is also known as demand. They do because they can.