Then the question you have to ask yourself is; how does it benefit The Man by keeping privileged information from us? Or how could it harm them to let us know the truth!?

Perhaps, the aliens bring a message of peace; a blueprint to utopia, or maybe just admitting that humans are not the end all be all of the universe destroys the mythology of our culture. The myth that the planet and universe and everything in it exists to serve humans, and whatever we do and however we do it is "right".