Time and time again banks are caught engaging in criminal activities. They profit billions and are fined only a percentage of their profits. This means that their criminal activities are still profitable.
These activities disrupt the economy and it drains money and confidence from the system as a whole.
Charge these people with criminal charges, bar them from working in the financial sector and apply jail time if needed.
How can Martha Stewart go to jail but not the people who engaged in years of currency manipulation.