I am with Alan in that I think there is life out there somewhere. I also feel that some of them look at us and what we are doing to each other and tell themselves they want no part of that so they keep going. We may have a note as a place to avoid in the galactic travel agency.
Well look at us. We are barbaric. Killing each other because one does not believe as another. Finding new ways to kill each other? I think if anything aliens would stay away. Alan had some good points but who knows how true or false they are. After all it is just an opinion.
True, they might stay away. My thought, hope really, is that if there are aliens more advanced then us they see the potential in us. Perhaps we're like they were 1000 years ago. Of course, we should probably hope his other hypothesis is correct and they are benevolent and not coming to enslave us and steal our resources to augment their depleted world.