As far as healthcare goes the very very poor and the very very ill get treatment in our country.
I didn't say they were.
However, there are many (even here on this very forum) who would have it so.
Many who advocate "every person for him/herself" (do a search for the term "personal responsibility" if you don't believe me).
The problem is that for the uninsured, acute care is provided (anyone can walk into an emergency room and be seen, with or without money or insurance), but actual
treatment is hard to come by (chemo and radiation and surgery, for instance).
Yeah, if you walk into the emergency room with end-stage colon cancer, hemmoraging wildly from your hind end, they'll do something to stop the bleeding. They'll shove a wad of cotton up your butt and tell you to consult with your physician first thing in the morning.
What they won't do is admit you to the hospital, perform a colostomy, administer radiation, and start you on an intensive chemotherapy regime.
For all that, you need a referral to an oncologist- or a team of them.
You will not get that without insurance.
You will get acute emergency care. You will get bandaids, and directives to "see your primary care physician for a referral".
Of course, if you're poor and uninsured, you don't
have a primary care physician.
The further point is, poor and uninsured people don't widely receive the screenings (PAPs, mammograms, colonoscopies, etc) that can detect cancer (or even precancerous changes) at an early stage, before it becomes catastrophic.