if Kerviel superiors weren't informed of the mess is that Kerviel fault ? one guy plays around with 5 billions and no one knows what's going on . i mean any folk can hide 5 billions with one computer , risks were known but nothing was made to control the financial operations better because that kind of messy and insane operations were tolerated . i agree Kerviel paid for the system . nowadays financial operations are so complicated none can prove they are insane anymore , maybe in such circomstances it's easier to charge a single trader . 5 billions to pay and no way he can work in finance anymore , it's like the 300 years jail in the US no death but no redemption where it is supposed to lead to ?? nowadays justice is sometimes given with a dissuasion goal , is it efficient maybe , is it fair i ask ..
edit : 5 billions not 50 , we are not a zero less or more anymore