Some things can become simple when we don’t let our emotions run things.
That FBI agreement could put a lot of them out on the streets as ex FBI ers. Then, some of the really bad ones can be sent to trial based on their documented actions and that agreement signed by them.
A long time friend is the unofficial Senior Grandfather of local grand juries.
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He has to explain to victims and zealous cops/asst DA, that they really have no hard evidence for the crimes they want the bad guys punished for.
However, if the goal is to get the bad guys off the street and in jail, they need to go the Capone/Income Tax evasion road map. Try and jail them for a lesser offense that is often a slam dunk where the guilty ones plead guilty to avoid a messy trial that open up more bad news.
This FBI oath if violated could clear the streets of these thugs and put them in jail if used properly.