If you could cheat the government out of tens of billions of dollars and get fined $200 million and not have to make restitution for the money you bilked, how likely would you be to do it again? (Given that you were crooked enough to do it in the first place.)
http://www.zerohedge.com/news/2017-04-17/meet-brad-birkenfeld-lucifers-banker
(Update 30 June 2024 This article now behind a paywall.)