This is an argument I see all the time, and it obscures the real problem. The real problem is fiat money and the existence of the Central Bank. All banking regulations are just attempts to put band-aids on a corrupt, criminal system, and these regulations are put in place by the same corrupt politicians who benefit from the system.
All you need to understand when it comes to banking is this: End the Fed, repeal legal tender laws, stop gov't control of the money supply, and stop all moral hazards (not only the Fed, which is a giant moral hazard, but also the FDIC, Fannie, Freddie, etc.). Then all regulations can be repealed, except arguably to prohibit fractional reserve banking.