Free market ideology needs to grasp the distinction between commerce and finance. The basic libertarian ideology revolves around the government only preventing "acts of force or fraud." So, we don't need a whole Indian-style Permit Raj to tell Procter & Gamble whether or not they can bring out a new flavor of Crest. If the new flavor of Crest poisons people, well, they can sue P&G and win hefty settlements, and P&G knows that, so P&G doesn't poison all that many people.
On the other hand, in the financial sphere, there's a huge gray area over whether something will turn out to be fraud or not.
I take my money and deposit it in the bank, which tells me that I can take it out anytime I want. And then the bank decides that rather than lend my money to Procter & Gamble at X% interest to build a new toothpaste factory, it would be a great idea to buy a mortgage-backed security consisting of the lowest tranche of the second mortgages (i.e., the mortgages that enable the first mortgages to be, net zero money down) on a bunch of loans to roofers in Compton that they bought from Countrywide because it pays 2X% and, besides, they need the CRA credits to get regulatory approval to buy another bank.
So, one day I go to take my money out of the bank and there's a big line of angry depositors banging on the locked doors, and then a man comes out to say the FDIC has taken over the bank and you'll all get your money back (assuming you didn't put too much in the bank). So, I've got that going for me in my role as a depositor, but that's not so great in my role as a taxpayer.
Therefore, it's clear that libertarians should not be seduced by free market ideology when it comes to finance. It's a different beast than cash-on-the-barrelhead commerce. Fraud, including unwitting fraud, is always a big risk in finance.