A "major" car accident might be $10,000 in repairs. Also, for a smaller fender bender, the uninsured can simply drive around with the damage and live with it. And I don't think too many of the uninsured are driving around town in brand new $70,000 luxury vehicles, so it wouldn't take much for a big accident to make them simply scrap the vehicle.
Compare that to even a "minor" healthcare service that can easily be several thousand dollars (even at the insurance negotiated rate). Major? don't even bother estimating. And you can't really just "scrap" your body and get a new one, or "just live with" an appendix that needs to come out and is ready to burst, or an infection that needs to be treated.
It's a lot easier to go without car insurance than health insurance because of the potential dollars involved in the event you need the insurance. Plus, while there can be ways to drive responsibly and avoid many accidents, it can be more difficult for healthcare, as the human body is unbelievably complex and still well beyond our grasp of what effects what, and your body can be susceptible to so many factors beyond your control and knowledge (genetics, tiny bacteria/virus you can't see, the effect of mixing different chemicals in your body that it has stored over the years that no one knows the effects of, etc.) Also, ultimately, we ALL will have some healthcare issue which ultimately puts us 6 ft under. Many of us will have various health issues long before that point, so in some ways, it's guaranteed to come at some point.
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