What I find interesting about this question is that it is at once fascinating and silly. Fascinating because it would be incredibly cool to have someone like us somewhere out there. Silly because the distances involved are mind boggling, so it is highly unlikely they would ever be able to contact us.

So is there any real difference between they not existing at all and they existing and we (probably) never been able to know that they exist? All we can hope is to hopelessly theorize and write science fiction stories about them.