Dude the facts do not agree with your personal experience
I talked to the guys that sold this when it was happening. They told me that investors, particularly in Europe, didn't want to talk abut anything else for 18 months. Most of the people genuinely believed that because housing prices wouldn't fall and hadn't fallen for 60 years, the securities were safe. The banks believed it. The ratings agencies believed it. The academics believed it. Even the government and the Fed believed. Bubbles can only occur if most people believe it.
As for the charges, those were generally because they weren't informing investors that their prop desks were hedging their books, and they were, for the most part, minor relative to their total asset base. But that was a gray area of the law. Many firms settled because they didn't want to risk losing more in court.
You have to understand that the banks kept the riskiest portions of the tranches. That's why they were wiped out. That's why Citigroup had to be bailed out. Citigroup was insolvent because they drank the Kool Aid. The stock of Citi fell from $40 to $1 because of it. (It has since had a 1:10 reverse split.) They believed it. The CEO of Citi was fired because of it. Bear Stearns, Lehman, Merrill, all wiped out. They all believed it. Even Goldman Sachs, who successfully skirted a collapse did so because about half a dozen prop traders hedged their book. Most of the mortgage and derivatives desk who sold this stuff didn't know it was being put on.
But again, you have to look at the big picture. Bubbles don't occur because of fraud. Fraud occurs because of bubbles. The bubble loosens standards, which leads to more fraud because people think that markets can only go up, which covers a lot of stuff going on in the market. That's why all the really bad frauds like Madoff were exposed after the market collapsed. That's what you learn when you study hundreds of years of economic and financial history.
I agree that deregulation played a part in the financial crisis. Deregulation has often led to financial booms and busts. But your topic about broker licensing is so inconsequential, to blame it on that is simply incorrect.