If these companies assets or stocks go to zero or are locked due to fraud or something that makes the actual public stocks untradable, how do you get out of a short position? Borrowing and selling the stock means you can’t get it back to return to the original owner, and buying put options means you can’t sell the stock to the contract holder. Do you have to get out before it gets completely vaporized?
If it's illiquid - you don't.
Jeopardy with market crashes isn't that you'll be forced to sell your stocks low but that there will be no one to sell to and you'll sit on assets devaluing to zero or close.