So one thing people forget about serious illnesses is that it's not just about the cost of medical procedures. It's possible that the only doctors who know how to treat your particular condition are in another city, so there are travel expenses involved. Plus, if your health issues mean you can't work for a long period of time, that can also impact your finances.

(for what it's worth, I currently work for a company that makes software offering various kinds of secondary insurance, and I've spent the last few months learning about the kinds of things "cancer insurance" and "accident insurance" are for, and it's been an eye-opener)

And as for your car: yeah, liability insurance is compulsory in the US, but it's really painful to be hit by someone who's illegally uninsured. It actually happened to my mom a few years ago—she got lucky, her insurance was willing to pick up the tab, but she could've been on the hook for a lot of money if her insurance punted instead (to be fair, the damage to her car was entirely cosmetic, and her car was still operable, just with a car-sized dent in it).