You are being forced to have costly health insurance if you even want health care (yay America, "Freedom!"). Even if your employer covers it, that money is still coming out of profits for the business that either you don't get in direct compensation or is added to the cost of the goods you are selling which someone then has to pay. So in the end, that 10% tax rate difference if offset by the health insurance direct and indirect costs you experience. You are paying that insurance whether you get sick or not too.
Also, the cost of most procedures, drugs, etc. here are less since we are public and we don't have crazy rates billed to a health insurance provider (which just get passed on to you) and there's less "for profit" operation of the system. For example, the one immune booster drug my wife is getting costs around $2000-2500/dose here, the same drug in the US is $6000-8000/dose.