There's no problem with prosecuting bankers under laws that are tightly written and which can only be violated knowingly. The apocalypse case can only occur if

There's no problem with prosecuting bankers under laws that are tightly written and which can only be violated knowingly. The apocalypse case can only occur if bankers feel like they have no way to avoid being guilty, which is certainly true under AML laws but not really true under many other kinds of laws (like ordinary fraud).