
There are a lot of interesting things to be learned indirectly from all of these Wikileaks document dumps. The most visible lesson, of course, is that governments regularly lie to their citizens to further unpopular agendas, hiding evidence of unspeakable war crimes and attrocities by the military and intelligence agencies without any meaningful accountability from Congress or the public.
Less visible is the irony that while the U.S. government consistently cries wolf over the potential danger to informants and the like from these document dumps -- and while no person has even gotten so much as a nosebleed as a result contrary to these exaggerated complaints -- the act of obsessive government secrecy itself is actually and truly putting lives in danger.
One important finding in the 9/11 commission report was the lack of information sharing between America's various intelligence agencies (over 15 in total) that prevented any one agency from putting the whole picture together to prevent the attacks on the World Trade Center and Pentagon. These barriers were erected after President Nixon abused those intelligence agencies to spy on his personal political enemies as safeguards to protect the privacy and safety of the American people.