I guess you should tell that to the emergency rooms where people get pregnancy tests, treatments for headaches, flu, etc. because they refuse to see a doctor where they have to get an appointment and pay for it.
Of course there is still abuse but if someone doesn't have insurance they will get a bill for the service. Even if it is an emergency a person still gets billed. You either pay or it goes to a collection agency.
Some people are eligible for state aid but if you're not the e room is not free.