Exchanges in this case still provide the necessary liquidity. It can drop to 0.0001 as long as there are buyers and sellers an exchange can make money. What are they supposed to do when you buy something thinking its legit? You're the one who has to make decisions based on the information available. Maybe they fix the contract or fork (idk if thats possible) and people will want to buy.
Sucks what happened, but you cant blame an exchange doing its business which is to match buyers and sellers.