He believed the secrecy stamp was something that was improperly used. And I suspect he would think this was a continuing abuse of the secrecy stamp to try to remove embarrassing documents from the public eye.
It's my father's legacy. The government has always, and continues to this day, to abuse the secrecy stamp. My father's view was that the public is the employer of these government employees and has the right to know what they're up to.