Format of this fallacy

Most people believe that ''X' is true
So it must be true

But this kind of reasoning is not valid and it is a fallacy.

Lets say a large number of people are convinced to believe that 1+1=3 . But because a large number of people believe it this does not become true. 1+1=2 always - irrespective of how many people believe otherwise. Lets look at some examples from history

-At one point of time everybody believed that the Earth was flat. It didn't become true because many people believed in it

It was believed that the earth revolved around the sun. We now know the facts to be different, and that the earth revolves around the sun.

More examples

- Millions of people voted for this government. So this government can't be wrong
- Seven out of ten people in the Sales team believe this sales promotion won't work. Therefore it won't work
- So many people believe that X will make a great Prime Minister. So X will make a great Prime Minister
- Everybody believes X is guilty of the crime. He must be guilty

If Scientists were victims of this fallacy, we would truly have no progress in science at all.

Author: A S Prasad – Critical Thinking Trainer and Visiting Faculty. Lead author of the textbook “Critical and Analytical Thinking” (Cengage)