1. I am not sure about US banks, but in my country banks earn money by transforming the maturities and amounts of deposits and spreading around risks to give loans, as well as providing other services such as card payments. Competition forces them to work relatively efficiently.
2. In my country, people who do not display "due care" when acting as officers of a limited liability company can be sued.
3. I very much doubt that being publically dragged through the dirt for wasting $9m of customers' money will look good on their CVs, let alone help them get better jobs.
I do admit that sometimes scams and fraud happen but I do not share your conviction that the whole environment we live in is built on it alone.