Presumably, any alien race advanced enough to visit us would observe our planet for a while before they visited us, and I think that after they watched the human race sufficiently, they would most likely avoid us altogether or steralize the planet.
Even if the open windows of science at first make us shiver after the cozy indoor warmth of traditional humanizing myths, in the end the fresh air brings vigor, and the great spaces have a splendor of their own - Bertrand Russell
