Thinking we're alone in the universe is dumber than "the earth is flat"
200 years from now the millennials are going to be remembered as the dumbest generation in human history because they had so much information and technology at their disposal but STILL had the asinine belief that humans are the only intelligent species in a possibly infinite universe. It's mind boggling. There are literally trillions of planets hospitable to carbon based life capable of sustainable evolution in the same manner as what occurred on earth over millions of years.
And people don't think there will be millions of other planets with a head start on earth? This is beyond a lack of common sense, it's humanity's delusion based purely on ego. Human existence is still somewhat "special" in the sense that probably only 2 percent of the universe has life and even less of a percentage has intelligent life, but that 1-2 percent means there are million of other species who share sentience abilities.
At some point contact is going to be made and people's minds will be blown. The religious folk will start to panic and change the bible. There will be massive chaos and breakdown of society. And over what? Because people are too stupid to realize what should be painfully obvious to a semi-intelligent 12 year old.