The Earth is flat. At one time it was scientific consensus.
I tell that to people all the time on the left. They act like “Hey, I am the one that is supposed to call you a flat earther because you don’t believe in anthropogenic climate change”.
Then I say, the consensus was that ulcers were not from a bacterial cause as well. Then they realize they are in trouble and change the subject.
The way we're headed, it may be again.