The probable reason that the government will not admit to what it knows is that they would be mostly helpless to explain to Congress who THEY are and what their intentions are. Since they have the responsibility to provide for the common defense, they wound likely cause more panic and disruption in society if they told the truth, something they rarely do anyway. Many religious people are in agreement with John Lear who told Art Bell in September 1989, "Art, if there is a GOD in heaven then the [grays] are of the devil."