They come here for mostly one reason. To check on our progress. Why, because we are them. How do you think we really got here. Do you really believe we just all of a sudden appeared out of no where. Do you believe it was just magic. Have you not seen ancient hieroglyphics, pictures of ships within them. They came here, colonized and left. But since then we have gone off the intended path. We are not ready for them to completely return yet. We are to busy having power over each other, trying to kill each other. They will soon come back, but that won't happen till everything here comes to a head. And once the dust has settled, they will then start over with us.