I am providing real life examples, not a straw man argument. How would the market solve the issue of iodine defficiency? Perhaps those people living in areas of endemic goitre with undamaged IQ would be enticed to buy high iodine containing foods?

You could say the same about smallpox eradication, which would not have been possible without vaccination programs. These are just examples. I am not talking about individual healthcare, which can and should be privatized, but public health services.