Why not? It's not like they spent any of their time watching terrorists or anything back in the day.
Typical day at FBI HQ in 1990s
Junior:  Sir, we have a report of some guy in Oklahoma who just bought a shitload of shit and another report that a bunch of Arabs joined flight school.  Also a report of strange behavior by a maths professor   
Senior: Hmmm, anything else?
Junior:  Well, there is that bank where 25k went missing. 
Senior: Holy Shit!
Hardly! More like...
Junior: Sir, we have a report of 19 men who applied for and got visas, but they didn't qualify.  

Senior: I don't care if they don't qualify... The order came to have them issued. This order came from above!  

Junior: These same guys applied to flight school, and aren't concerned about landing the plane only flying it.  

Senior: Shut up! Leave them alone. This order is coming from above.  

Junior: We have reports from intel all over the world that they plan to attack us using airplanes on Sept 11
th  
Senior: 
Leave these guys alone!... or it's your ass!    
   
Neohawk spokesman: no one could possibly have known this was coming.  

Junior:  

 (unable to speak with a gag in his mouth)
The people:  
