If you have an illness long enough to lose your job and your health insurance, you probably aren’t able to pay all of your bills. Hence medical bills are likely a distal cause.
Right. But, again, a) the job loss is going to happen anywhere, in or out of the US, and b) having medical bills among the debts one can't pay without a job is not the same thing as "American with job gets hangnail = bankruptcy!!!", which is what one would believe based on the typical rhetoric on the subject.