Why do people believe conspiracies?
Part of it is down to proportionality bias. It is a tendency of the human brain to convince us that big events must have a big cause. Rather than accept the simple explanation, it’s somehow easier to believe an elaborate conspiracy.
Another factor is projection bias. We think that other people think like us, and if we’re suspicious, or behave suspiciously, we believe that others will be hiding the truth too.
Then there’s confirmation bias. We’re much more likely to accept evidence that agrees with our existing beliefs than evidence that contradicts us. Once someone gets invested in a conspiracy, they’ll become more and more convinced that it’s true.
We are more likely to accept evidence if it agrees with beliefs we already have