The Conspiracy Theory Fallacy is a group of fallacies. That is why those who believe in a conspiracy theory cannot be convinced by the evidence. The theory is unfalsifiable.
The first fallacy is confirmation bias. This is the tendency to only notice information that confirms one’s prior beliefs. Things that don’t fit the theory are ignored or denied.
The second fallacy is called the furtive fallacy. This is when outcomes are asserted to have been caused by hidden misconduct by decision-makers. It does not merely consider the possibility of hidden actions but insists on them. It can lead to general paranoia.
The third fallacy is called the canceling hypotheses fallacy. This is when one defends one belief by proposing a second belief to explain the lack of evidence in support of the first belief. There is sometimes related to furtive fallacy.
People want life to make sense, and so they will grab unto a conspiracy theory to make sense of things. This is extremely dangerous, because it removes one from reality. We should aim to live an evidence-based life. It is the only sure path to truth.