I understand now why there is a difference of opinion on this.
There are two sorts of regulation.
One is market based. It is anti-fraud (fraud is theft), enforcement of property rights (bankruptcy not bailouts etc.) and the natural market incentives of competition.
The other is the positive, politicized regulation like the SEC and FED.
When people talk about removing regulation of Wall Street, they are talking about removing the second part of regulation because it is ineffective and reduces competition. It encourages fraud when the government (which is pretty incompetent at nearly everything it touches) is the only regulator in the system.
For example, Madoff was best friends with the SEC, and despite years of reports exposing him, the SEC turned a blind eye. There was no competition for the SEC to do a good job, and government agencies which fail, get more funding and more power, so the incentives for a government agency are not to do a good job, but to allow little crises which expand their scope over time.
But I digress...
These Wall Street crooks wouldn't have dreamed of doing what they did in the last 2 decades, if they didn't have almost 100 years of protection under the FED. In the old days, banks went bankrupt when they were insolvent. That kept every bank on its toes and fighting for customer deposits. Deposit insurance is a get out of jail free card for banks, and lulls depositors into thinking all banks are equally solvent. The result is consumer apathy, where people don't really worry about which bank has their money (or how they use/misuse it), because it is all "insured" the same. The reality is, when a bank messes up, the consumer ends up paying the cost in inflation, and while they get the nominal dollars in their account back, the purchasing power is diminished.
That is the great trick of central banking. It diffuses the penalties/losses across everyone (except the bankers), so that the pain is never great in magnitude until there is a recession, which then gets blamed on greed or some other false culprit. People have trouble perceiving the effects (and thanks to propaganda, cause) of inflation in the short term, and in the long term, there is no political will to correct the problems of the past (balance budgets, pay off debt, return to sound money etc).
No one has fought the banks harder in the 20th century than Ron Paul. Paul opposes banking regulation because he knows it is designed to help the banks. I'm not appealing to him as an authority, but I know some people like Ron Paul and are still for regulation. Check out his reasons, I am sure he can make the case better than I can.
Ron Paul, Statement on the Emergency Economic Stabilization Act of 2008