But this is the market at work, surely? If the lender lent money to someone when the market was good, and then the market changed and the debtor can't repay, th

But this is the market at work, surely? If the lender lent money to someone when the market was good, and then the market changed and the debtor can't repay, then that's just bad luck and they lose their money. That's what's supposed to happen in a market.