No, the criminals are extremely smart. Its just that these were amateurs who didnt know that in Anglosaxon common law, you have to avoid being honest about anything and even deny any wrongdoing even if you get caught the act of murdering someone. Then you can exercise plausible deniability, claim incompetence or mental incapacity and you can negotiate your sentence. Any kind of honesty works against you in the US law as a result. That's how you end up with people who are total experts in their field testifying in courts that they "didnt know" that something they did would cause so much harm to something or somebody or the society.
As of this very moment, thousands of much, much bigger corporations are actually destroying the entire US society in a real way and not like these amateurs who were just shuffling some funny money. But the real psychos know how common law works. There wont be any trail of their wrongdoing, and when there is, there will always be plausible deniability in that trail...