Actually, many people do. Many do not have insurance, and do not receive care for various ailments until it's too late. Many do not have insurance and do not have annual physicals, or mammograms, or prostate exams, or pap smears, or any of the hundreds of such things.
Some hospitals offers limited free services, some free clinics exist.
But clearly many Americans are not receiving such care. This is not true. Again, I have to question your connection to current events. Again, I am not advocating that medicine be socialized or that hospitals be forced to treat those they choose not to treat.