Unidentifed objects are real and some of them even fly but the obsession with little gray men as threat or salvation is ... comical. Statistically, there should be tons of other civilizations that have made it to some state of technology BUT they could have lived and died 5000 or more years ago or could still be climbing out of the swamps right now. Number of inhabitable planets in the universe or even galaxy aren't the only statistics to consider.