I remember one of the main issues immediately post-9/11 was the fact that all the various agencies weren't sharing enough data. The NSA might have had this data

I remember one of the main issues immediately post-9/11 was the fact that all the various agencies weren't sharing enough data. The NSA might have had this data but they weren't looking at it because it wasn't relevant to their goals at the time. Someone else might have been looking at those guys but didn't have any/relevant/actionable data. No one was sharing anything because of budget reasons, "Why waste my budget on someone else's investigation?"