Why The Conceitedness?

Physicists show scores of examples of all the Goldilock zones the Earth is in, thereby making life possible. If we were outside even one of these zones, life would not have been possible, and so people believe that there is a supreme force controlling the universe and making it possible for us to live. Why do they assume that this 'supreme force' cares whether we live or not? Isn't it more likely that merely because the Earth is inside all these zones we happen to exist?...And not just that, maybe if conditions were different on Earth, we might've evolved to adapt to them. Also, why do people even have the preconceived notion that extraterrestrials will be anything like us? Maybe they don't need oxygen to survive...maybe they can withstand temperatures of 1000 degree.