In some cases the lack of enforcement translates to liberty. Take the case of the black market; what that means is that regulation is not being enforced. In my dictionary, the black market just means there is a free market, a libertarian market. So by letting the banks go unchecked will let some make mistakes, others will dabble in fraud, and many will go broke. Yeah people will lose a bunch of money, some will see their life savings dissapear, but in the long run things will be much better; only the most honest, efficient banks will be able to survive.