I could give a long list of examples and detailed analyses, but my secondary point is that a culture of corruption is enabled partly through talking things to death in abstruse legalistic terms, until everyone is so tired that they become demoralized and lose any motivation to do anything about it.
The US Constitution (not the only operative document, but an important one given the financial industry's very deep roots here) contemplates judicial powers to examine questions of both law and equity. Law is complex and if you have the resources you can hire legal specialists to problematize and pull apart just about any legal assertion. In many respects, a dense thicket of petty legalism surrounds a moral vacuum at the heart of society in which substantive questions about fairness and decency as eschewed as too political for judicial engagement; if you'll forgive my stretching a metaphor, much of our 'shining city on a hill' is just elaborate topiary growing atop crumbling foundations.
I have some opinions about who should have gone to jail (I'd start with the ratings agencies), but that doesn't rabble-rouse quite as well as 'Burn Down Greedy Goldman Sachs!'