I meant more the idea that we have a financial system that allowed this to happen. Since the repeal of the Glass–Steagall act there's been greater and greater instability and more opportunities for banks to reap large sums of money. Eating away at these protections allows for more exploitation basically.
In terms of protections from prison, basically controlling the firms that are meant to police them seems sufficient. No real accountability from the financial crisis seems to show that...