To add to this, the fraud was pretty brazen. For example, these bankers [1] approved a loan to a shell company owned by the bank's insiders for the purpose of buying the banks shares. None of the large banks in the U.S. did anything like that. The closest we've had is the LIBOR scandal, where prosecution is certainly happening.

[1] http://uk.reuters.com/article/uk-iceland-crisis-idUKBRE8BR0E...