While the question is not unreasonable, it is worth remembering that the FBI is not just a criminal investigation department. They also are the nations internal intelligence - I.e. anti foreign intelligence- leads.
And they are still bound by whatever who is in charge of the FBI wants. Always remember how the FBI was used in the Nixon era to target Black people and hippies [1].
[1] https://www.vera.org/reimagining-prison-webumentary/the-past...