Wanna bet?
The entire audit profession took a major hit on this. Auditors have to maintain professional skepticism, and sometimes open the filing cabinet drawer to see if there really is a piece of paper with a customer's signature in there. (That refers to Penn Square, the Enron of the 60's or 70's). By the way, the firm that blew that one survived for a while, then got name-changed several times from one of the Big 8 to one of the Big 5.
And to address another poster's comments: the first rule of financial investments is Diversify, Diversify, Diversify. There are laws that allow companies to violate this basic principle, and guess who wrote those laws?