Not all of them, certainly, but if you manage to arrest the CEO or board members of just one bank engaging in crap like this story I heard this morning, then I'll bet we would start to see a whole lot less of that type crap. Also, too, foreclosure fraud.
Seriously: just arrest a few of 'em and sentence them to 5 years--maybe start with Jaime Dimon? Not nearly enough of a penalty for the harm they have inflicted and are inflicting, but it would get the rest in line right quick. Either that or they would "go Galt" and we would still have a better society as a result.