You're right, but that's pretty exceptional and I feel like something you really ought to know is a potential scenario. (I was aware of it at least as someone with stock options throughout 1999-2013.) This is different in kind than a medical expense which can happen to anyone randomly and bankrupt even those who thought they were insured against it.

I think I have very good medical insurance through my employer and I'm still terrified an unforeseen medical expense will somehow bankrupt me.