I'd rather not "contribute to society" by having my money taken from me at every conceivable opportunity. I'd rather that
everyone in society contribute more or less equally (or, at least, according to their means and nothing else), which is currently not even remotely the case.
> How do you have a coercion-free market when the consequences of not buying in can include "you'll die or be bankrupt"?
This is such a silly argument. Are any changes in your utility function "coercion"? Is the fact that you have to eat food "coercion"?
Coercion-free means that you're free to behave rationally and make decisions that optimize your utility. It doesn't mean that nothing bad will ever happen. I'm really not sure how people get from the former to the latter.
If you're worried about having a heart attack, you should be able to buy an insurance vehicle that charges you commensurately with the risk of that happening. (Unfortunately, you can't; you also have to pay for other people's quadruple-bypasses, geriatric medicine, and 8th child.)