A
conspiracy theory is an explanation of an event or situation that invokes an unwarranted
conspiracy, generally one involving an
illegal or harmful act carried out by government or other powerful actors. Conspiracy theories often produce hypotheses that contradict the prevailing understanding of history or simple facts. The term is often a
derogatory one.
[3][4][5]
According to the political scientist
Michael Barkun, conspiracy theories rely on the view that the universe is governed by design, and embody three principles: nothing happens by accident, nothing is as it seems, and everything is connected.
[6] Another common feature is that conspiracy theories evolve to incorporate whatever evidence exists against them, so that they become, as Barkun writes, a closed system that is
unfalsifiable, and therefore "a matter of faith rather than proof".
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wiki
A repeated belief for which there is no supporting proof or evidence. Russian collusion with the Trump campaign is a good example. It is constantly repeated by people and media as true without any proof or evidence provided.