That's the problem with 'The Big Short'. It's a terrible film because it mostly points the finger at bankers as somehow 'guilty of some crime' - and they are not. They are 'guilty' of doing some things, but not breaking the law for the most part, and they didn't get into some other issues, particularly they didn't want to point fingers at the millions of Americans who lied on their mortgage applications.
There weren't really any crimes obviously committed in the 'big short'.
Maybe the hucksters in Florida overlooking issues on loan applications.
Maybe the ratings agencies ... but it would be extremely hard to prove this one.
Ultimately, the banks stupidly gave credit to people they should not have, and it inflated really badly and got out of hand. Stupid lazy bankers all around bought crap without doing due diligence and they paid the price.
It was people making a lot of bad bets due to the underlying failure of information the system.
All the individuals lying on their loan forms are at least as guilty as anyone else.
"At banks. At rating agencies. At investment firms. In the government"
You'll have to list specific examples, because I see greedy people making stupid decisions, not fraud.
The ratings agencies didn't commit 'fraud' - they did not accept 'money to change their ratings', this would be fraud. What they didn't do well is their actual jobs, because to do it well would have meant less business. So this was a conflict of interest that led to a really bad outcome, but it's not outright fraud.