FBI cares less about preventing terrorism, more about increasing own power. Film at 11.
Ouch. Apparently, the FBI deliberately delayed a supposedly-important anti-terrorism investigation so that they could use the delay to persuade Congress to grant them more powers. (Specifically, they told the person investigating it to give back the documents they'd already obtained via subpoena and demand them again through a "national security letter", something they knew would fail since they weren't allowed to use NSLs for this. They then used the resulting delay as a reason to get Congress to pass a law allowing them to demand a much wider range of things via NSLs, eliminating all sorts of inconvenient-but-vital judicial safeguards.)