Those were exceptionally (almost laughably) easy cases and, IMO, make my point. The hard ones were the myriad cases of ratings and other deceitfulness that led up to the 2008 financial crisis. Only a single top banker was successfully criminally prosecuted, and the list of settlements was infamously underwhelming: https://en.wikipedia.org/wiki/List_of_major_SEC_enforcement_...
For further reading see https://www.propublica.org/article/the-rise-of-corporate-imp... and https://www.theatlantic.com/magazine/archive/2015/09/how-wal...