First off, ya spoiled the movie for me. I wasn't going to watch it, so that doesn't bother me.
Secondly, none of this surprises me, because guess what happens to DAs who try to go after big banks. Hint: they aren't eager to give you a pat on the back and a raise.
Just look at what happened to that Spitzball guy, you can go ahead and bang call-girls for years, but the moment you want to get some real shit done at your job you get these "anonymous sources" pretending to be call-girls or strippers or whatever crawling out of the woodwork spilling the beans on you?
He's lucky he just got publicly humiliated, he got to keep his wife, his life, and now he gets to go on tv and be a talking head for acting like it's water under the bridge and serving as a living lesson to others who would want to do what he tried to do.
Literally every time any DA turns on the tv, accidentally flips the channel and sees him on television they're reminded of what might happen to them at BEST if they want to go after the big boys.
And I can see why it's like that, financial power, the state of the US as a superpower and its ability to cash checks larger than any empire in history are intertwined with its banking sector's ability to convince wealthy investors worldwide that it's a safe place to store wealth and get ROI.
So if you're one of the favored banks, especially one of the primary lenders, you're going to get special treatment politically, economically, and legally, because that's a small price to pay for the trillions upon countless trillions the US is able to float as debt and leverage to keep and expand its sphere of influence.
Small cases like the ones mentioned in this movie are par for the course. Everyone hates people in a certain sector? Fry a small fish and serve the process up to the public. Look what happened to the CEO who tried to tweet a little too much "when keeping it real goes wrong" level shit about his pharmaceutical industry job and jacking up the prices. They will fucking have you hanged if you talk about the wrong shit or try to get under the skin of the wrong people, at least if you go about it as an individual.
It's always the same shit. Oh, the general public hates how an industry goes about its business? Leave the structure intact, protect all the connected players, destroy some sap's life when they were doing either the same exact thing as the rest of the top dogs or something much more benign.
Well, that knife shit? Yeah, if they're going to prosecute individuals then they really need to take a closer look at vendors, if a city has less guns then knives are going to be more of an issue, just look at any country where guns are nearly extinct and you'll see that stabbings become a little more frequent. Murder rates themselves are culturally and economically influenced so the US in general would be better off leveling out household incomes and offering psych than trying to do unenforceable things like take away everything that could possibly be a weapon, or everyone is going to have to figure out how to chop their vegetables with marshmallow knives real quick.