What's your opinion? Because it will embarass the country? I think the powers that be don't want anything embarassing to come out because it reflects on them.
I haven't seen anything on Cashill's book, but another guy named Spence (?) has just come out with a book covering all of the things the government has covered up, including all those things that you mention.
My opinion? I think it's a political strategy to move on from the considerable corruption of the Clinton Admin, for PR purposes.
Check WorldnetDaily.com, look for 'Mega Fix'.