Post Hoc Ergo Propter Hoc

Assuming that because event B followed event A, A must have caused B. Correlation is mistaken for causation.

Example

"My child was vaccinated, then developed symptoms of autism — therefore the vaccine caused it."

Theories on Conspirafy that exhibit this fallacy

• Chemtrails: Chemical Spraying from Aircraft — "Contrails appeared after military jets flew over, therefore the military is spraying chemicals"

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