Now this is a theory, so understand that I have no solid evidence in any of this. But it makes sense... Maybe when the incident at AREA 51 happened, the government found out things about the earth. Maybe they found out Earth was created by another lifeform, proving religon false. This would be a rational reason, seeing millions and millions of people would find out that they have believing something untrue. This might cause complete chaos, people angry for believing the untrue. I know this is far fetched, but hey, I can have my theories as well. Its obvious the government is hiding something tremendously huge. so is this not a rational reason for a cover up?