In recent cases, all levels of the FBI were complicit. Removing funding may only take away resources from useful areas while guilty parties are free to continue their bad behavior at the risk of only a stern talking to by Congress every few years when they promise this will certainly be the last time this happens. Throw some agents in jail along and see if the behavior continues?
Imagine you or I caught lying to the FBI, lying to the courts, and then lying to Congress. What would our fate be? Certainly not continuing on with the status quo.
Since DOJ has no interest in keeping itself accountable, what can be done? Can individuals who were caught up in this file criminal or civil complaints with any hope of relief? For someone not caught up in this, how can they prevent tax dollars from funding ongoing criminal activity?