There is no market regulated by strictly market consumers (i.e. a free market) in traditional banking. Were there one, depositors would shop around and pay attention to the credibility of each bank which in turn would force them to compete with one another and not collude. And it's that simple to solve this problem: remove FDIC, remove all guarantees, remove lenders of last resort, remove regulations and BOOM all the crooks will go up in smoke and what will remain are the honest players.