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What I do care about is tax dollars being used to fund abortion... or birth control... or free healthcare... or anything else that is not a public good.

That's the point. Someone thinks health is a public good and one of basic rights of individuals ; )

Road, bridges and so on are all paid with taxes, and not used by everyone, just like "free" healthcare. But I think health is more important than roads...

I agree with you free market is better than government subsidies, in general.
The only problem is: when I can't afford healthcare, I will not care if it's the government or the free market. I'm just sick and cannot afford my treatment.

So we can't just stop free healthcare / subsidies and say: everything would be all right if we were in a free market system with high level of competition, because we're not in that system...

Before Obamacare (not that I like it) US had one of the less "public" healthcare in the world, but poor people were in big trouble.