Answer: We are building up history.
Explanation: Though this question cannot receive an exact accurate answer due to differing opinions, I can give what I, and the majority of the American population, believes. We record history in order to remember and avoid our past mistakes. While, yes, most of history is made up of mistakes, the government probably won't want to cover that up. All of the government is made up of real people, and a lot of people tend to forget that. They are human like the rest of us. That being said, there are too many people involved in the government, media, and population in order for most cover-ups to be done. It is simply not possible.