Michio Kaku once said- Some people say if there are intelligent lifeforms out there, and I think there are, How come they dont visit us? Why dont they land on the White House lawn, announce their presence and give us their technology? Well, if youre walking down a country road and you see an anthill, do you go down to the ants and say I bring you gifts, I bring you trinkets, bead, I bring you nuclear energy, take me to your ant queen? Or do we have this strange urge to step on a few of them? If aliens are so that advanced that they can land on the White House lawn, then we are like ants to them, we have nothing to offer them, so the reason that they dont announce their existence to us is that were boring, theyve seen it all. We have nothing to offer a civilization that advanced and thats why I think they dont visit us. We are arrogant to think that we are so interesting, extraterrestrial beings would travel thousands of light years just to visit us. So thats why they dont visit us, were just not that interesting.