Up to 4%? Wouldn't that simply be considered cost of business for some corporations? Pay less in security, etc. and just consider the 4% a smaller tax of sorts?
Few bank CEOs have survived the various "we will get some payback for 2008" fines over the years.
If you want to change corporate culture, you don't need to destroy the company, just hold a gun to the head of each CEO and see how fast they make sure everyone else dances.
This is one of the best things about Sarbane-Oxley - the CEO actually signs off the accounts and will go to jail if the accounts are misleading. so guess what has had top priority at banks across the globe?