[simonh]

The marginal cost to the patient for having that treatment was zero.

Meanwhile in the US the federal government spends 8% of GDP in tax payer funds on health care, for things like Medicare, Medicaid, CHIP, etc. That's the same as the UK pays for health care, counting public and private expenditure combined. You are already paying the cost of an entire first world health care system in your federal taxes, and as an employee you and your company also still have to pay for your own private health care to actually get any treatment for yourself.