Look, there's a lot more going on here than failure of personal responsibility. There are serious economic concerns at work, some of which (the bad loans, price undercutting, massive federal budget waste) are precisely the fault of an inoperable government. There are rules against a lot of the banking practices that got this mess started in the first place, and room to write new rules for things that aren't covered. The problem is that for the last 25 years, and the last 8 especially, the nation and the people it elects have been convinced of the idea that the less the federal government does about anything, the better.
Governments don't spring into existence just to be the enemy of progress and efficiency, and aren't run by mustache-twirlers who cackle as they light your money on fire. Demonstrably, quite a few banks are. That is what the government is for, stopping practices that take advantage of people's money or trust, and helping solve problems without an eye to personal profit.
For this banking problem specifically, that is exactly why nationalization is the answer, because it can short-circuit the market logic that has destroyed the credit pool. Right now, there are loads of banks stuck with mortgages that can never be repaid and bond-bundles in other banks stuck with similar bad mortgages. So they can't lend out credit to responsible businesses and customers, because they've got too much capital tied up in these funds that will never return to them to give up now, at least according to the rules of operating a normal business; but at the same time can't do anything with them, and risk being dragged into complete insolvency. If the government takes over a bank, it can then liquidate or even just dissolve those crippling assets, because a government is under no obligation to turn a profit. Once those assets are gone, the banks will then be solvent enough to attract clients and customers again, and then afford to lend credit, and on we go with a functioning market. It worked in Sweden and Germany, and it'll work here too.
This crap about how the government taking any direct action into a business will instantly turn it into a bastard child of the Vagonka and the Post Office has to stop, along with the rest of this Reagan-myth, "the government is always the problem" nonsense. Every two years, politicians of every stripe are forced to go out and campaign on a platform of how government is wasteful and paralyzed, and only they can solve it. Then they get in power and proceed to throw money away and cripple programs, then go back out and campaign on waste and paralysis again. Maybe, just maybe, if you had a little faith in your government and elected people who wanted to make it do things for you, you'd actually see some activity you can be proud of.