There were organizational silos in the intelligence agencies. The planning of the attacks became clear once the data was gathered in one place. Still, that was

There were organizational silos in the intelligence agencies. The planning of the attacks became clear once the data was gathered in one place. Still, that was only done in retrospect and many things become clearer in retrospect. Out of the aftermath of finger-pointing and brainstorming how to improve communication we could have had an additional small agency responsible for tracking, collecting, and making sense of threats across agencies. What we got instead was a major reorganization of the US federal government, the formation of the Department of Homeland Security which oversees far too many investigative and law enforcement personnel under one office, and the PATRIOT Act.