I am sure there was fraud as well. But fraud doesn't explain the financial crisis. Investor complacency, untested new product, excess leverage and reliance on short term funding, too much liquidity in the system, interest rates too low for too long, these were the fundamental reasons.
There's a world of difference between "We misjudged the long-tail risk of the instrument we rated" and "We straight up lied so that we could keep getting business from the banks."
Half the mortgages in some of those AAA instruments were issued to people with income at minimum wage, or with credit rating in the 500s, or to people buying homes that were never even looked at by underwriters. This isn't a "Whoops, our math was a bit off, we didn't expect the collateral to drop in value for a bit."
This is straight-up fraud, and the people carrying it out should have been taken out back, and had their shirts taken away from them. We need more, not less personal responsibility from our professional sectors.
Fraud is the only thing that caused the financial crisis. Period.
Fraud from the top on through the bottom. The guy lying about his income to the mortgage broker who knew the dude was lying (and likely told him how to do it effectively), to the ratings agencies lying, to the wall street banks lying, to robosigning, etc. etc. etc. It was outright fraud every step of the way and almost no one who participated in that market has clean hands.
There's certainly more due diligence that they could have done, but that's a red herring. There was plenty of outright fraud on the part of the ratings agencies. No subprime mortgage should have been rated triple-A. Yes, you could blame investors and pension funds for not realizing that they were systemically duped, and buyer beware and all that, but the ecosystem expected that CRAs were not flat-out lying to them.
Also, some of those investors were legally obligated to invest portions of their portfolio into AAA instruments. Their hands were, quite literally, tied.
> Investors losing money = investors suing. Selling products that you don't believe in yourself = testifying in front of a bunch of angry senators waiving internals emails about "shitty securities" at you.
When I buy a shitty penny stock from my stock broker, and the stock tanks, I can send as many nasty e-mails to him, and my senator as I want. Unfortunately for me, nobody will care one whit.
When Charles Schwab sells me a share of MSFT stock, it's not because they believe, or don't believe in MSFT. Their opinion of MSFT is completely irrelevant to this transaction. They do it because I asked them to sell me a share, and because someone else asked them to buy a share.
When some crook sells me a mortgage that they underwrote, that they then bribed a credit rating agency to rate highly, that I'm legally obligated to buy... That is an entirely different situation. Do that enough, and you bet some state senator is going to be gunning for them.