Religion, politics, and music are forms of advertising. So are nationalism, racism and sexism. If humans could see themselves the way non-humans do, they would assert that their differences make them less part of the mass of humanity and more part of the best of the minority.

It is entirely possible that the rest of the universe would like to stay clear of our sectarian and plebian divisions and make the demarcation line in the sky where the humans and non-humans don't meet.

It is a peculiar conceit that humans believe that non-earthlings would have any useful reason for visiting this planet when they have the whole rest of the universe to visit with none of the problems they would encounter here.