Sixteen years is a long time to expect the American public to wait to know who was behind 9/11, the most significant act of terror in modern U.S. history. Unfortunately, the wait continues because of the resistance of federal agencies to openness, the over-classification of information and the weakness of the Freedom of Information Act.
Vast numbers of investigative and intelligence documents related to 9/11 remain classified. The FBI alone has acknowledged it has tens of thousands of pages of 9/11 reports that it refuses to make public. To make matters worse, agencies withholding information tell what are essentially lies to make their actions seem as acceptable as possible.
For example, the FBI repeatedly has said its investigation of a Saudi family who moved abruptly out of their Sarasota home two weeks before 9/11 — leaving behind their cars, clothes, furniture and other belongings — found no connections to the attacks. Yet statements in the FBI's own files that were never disclosed to Congress or the 9/11 Commission say the opposite — that the Sarasota Saudis had "many connections" to "individuals associated with the terrorist attacks on 9/11/2001."
http://www.tampabay.com/opinion/columns/column-sixteen-years-after-911-the-american-public-deserves-answers-not/2329923
http://911blogger.com/news/2017-07-10/sixteen-years-after-911-american-public-deserves-answers-not-secrecy