Is probably what it all boils down to...

Health insurance companies collect premiums and deny or pay claims, essentially paperwork. Without them, how many $billions, could be saved?

every adult even just $25,000 per year that would cost $6.5 Trillion every year. So, in ten years, our national debt would go from $38 Trillion to $103 Trillion. It's simply not possible.

Tax the rich.

I could get by on that

Trillion to billion …

No one could be taxed trillions …

Elon Musk is worth about 1/2 a Trillion. How would we tax him 6.5 Trillion annually?

And, it’s not like he has 1/2 Trillion sitting in a bank. That’s his net worth - all his companies, houses, cars, etc. right down to his kitchen knives.

and run to the doctor for every sniffle and hangnail.

The thing is, we are treating disease. Living responsibly to prevent disease is far cheaper (just like preventive maintenance on a car), but first we have to overcome the vested interests that feed off sickness, and in many instances make you sick because either they don't know what they're doing or they like to line their pockets. And that doesn't even being to scratch the pathologizing of illness in the mental health field.

to pay for it. Thomas Paine: agrarian justice

"Cultivation is at least one of the greatest natural improvements ever made by human invention. It has given to created earth a tenfold value. But the landed monopoly that began with it has produced the greatest evil. It has dispossessed more than half the inhabitants of every nation of their natural inheritance, without providing for them, as ought to have been done, an indemnification for that loss, and has thereby created a species of poverty and wretchedness that did not exist before."
– Thomas Paine

https://www.ssa.gov/history/paine4.html