Not only did the whole system prove to be (and remained) corrupt, there were no heroes. The people who profited off the economic crash made off with millions, while already having millions to bet against the economy in the first place, and the people to lose (the banks) were bailed out with no repercussions and barely a slap on the wrist.
Aside from truthfully documenting and breaking down the systematic irresponsibility and sheer stupidity of the economic system, The Big Short unveiled the corrupt evil that tied together billions of dollars. And while refraining for directly bashing greed and the desire to profit, except for the few characters who directly contradict the profession of a greedy banker (such as Mark Baum, based on Steve Eisman), we have received a good lesson about the extent of corruption that goes on in practically every crevasse of economic our system. The system itself is set to benefit only itself, at whatever cost and no matter the consequences.
Now whether or not the trades made by the four clusters of subprime short sellers were true, or if Michael Lewis really "got it right", is not the issue. I'll let Wall Street debate their own fuckery. The significance of this movie is at the very least in its blatant non apologetic way of telling us, the viewer, how deeply they screwed our economy. It is not only about how irresponsible and downright criminal the banks, the investors, the realtors, and anyone else involved in selling houses to people who cannot afford them were (not to mention the people involved in packaging and repackaging the bonds in order to modify the ratings to then sell more bonds), but that the poor people are always hit the hardest when it comes to any economic crash are poor. After all, there were many people, in fact the main characters of the film, who profited off the crash. If anything, this is the underlying moral, the rich always find a way to profit. And if we all somehow lose all of our money, in the end, it will go to a rich hedge fund manager who knew to bet against the other rich guy.
So, where did all the money go? People couldn't afford to pay off their loans, banks foreclosed, then they went bankrupt, the insurance couldn't bay off, the system collapsed, we lost 8 million jobs, and millions lost money. Except the few smart geniuses who knew this would happen years in advance. So what changed now? Nothing. Business is as usual, no one went to prison, there are no significant laws set in place (as there were no laws to oversee the banks in the first place), and it doesn't look like anyone's really itching to change it. After all, it was the system overall, all of it, everyone - from the underfunded FCC, to the credit rating agencies, to the the very laws (or the lack of laws) that didn't make any of the shady business bankers conducted illegal, brought down the economy. And regular people were hit, and will continue to be hit, by the stupid actions of the wealthy and allow other wealthy people to profit off this stupidity.
The market is not a mystery, but the bankers and investors would like us to believe it is this magical force only they can understand. While it is complicated, it is only so by design, to keep people from understanding and thinking about what should be very illegal and what will only hurt us in the end. After all, as Mark Baum pointed out,
"Wall Street took a good idea, Lewis Ranieri’s Mortgage Bond and turned it into an atomic bomb of fraud and stupidity that is on it’s way to decimating the world economy."
"For fifteen thousand years fraud and short sighted thinking has never, ever worked. Not once. How the hell did we all forget that?"