I think that the Able Danger was an official coverup conducted by the Democrats to keep the Clinton administration from looking bad. The Democrats are using 9/11 as a political tool.
As for the rest, I think that there are things that we don't know, but we don't know them because they're military and diplomatic secrets. For example, they still haven't released all of the documents from WWII for reasons of national securiity. Few, if any, of us will see everything released on 9/11 in our lifetimes.
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