The Search for Extraterrestrial Intelligence came up empty. So we lowered our sights and began the Search for Extraterrestrial Life. This too was inconclusive. Chemical signatures in spectra could indicate life, but could also be inorganic in origin.
Then, one day, we found a signature that was unmistakably from a civilization that had recently poisoned its world to extinction.
Annoyingly, we could still not answer the question of whether we were currently alone in the universe.
Consider this a friendly, local pub. Make yourself at home, bring your friends, have a good time! Meet new people, have a laugh, enjoy the ambience, and the Oxford commas.