Even if they are uninsured, they can still buy whatever is really necessary medically can they? They don necessarily go without care.
Actually we know that the uninsured frequently do go without needed medical care. And that when things are critical they will be treated at ERs at a much higher cost to everyone (than earlier treatment). And we know that there are many who are forced to go without ANY ONE of the basic necessities even during relatively prosperous years for the country.