If you know anything about the universe and its complexity and sheer size, , the fact that there are billions maybe trillions of stars in one galaxy and billions of galaxies....its only leads one to believe that somewhere, there is life as intelligent or far more intelligent than us.
That doesn't mean they have visited us, but you cannot rule the possibility out.
If one wants to be finite and close minded about it, than its his or her choice.
I see no reason to be that definitive about such a matter.
But again, whitey seems to constantly be on the defensive.
Look eye, always look eye.