"Lehman Brothers failed 5 years ago, and the statute of limitations for most federal crimes is 5 years..."

"... so the retrospectives are full of recountings of the fact that no one important has been prosecuted over what happened...."

If you could convict Ken Lay over things his subordinates did and his own "we won't stop trying to save this company and I'm confident we will succeed" statements, it's pretty surprising that not a single banking CEO has faced a similar fate. 

But no jail time doesn't mean nothing... the government is looking to civil, rather than criminal penalties....