Plausible deniability is the ability of people (typically senior officials in a chain of command) to deny knowledge of or responsibility for any damnable actions committed by others in an organizational hierarchy because of a lack of evidence that can confirm their participation, even if they were personally involved in or at least willfully ignorant of the actions.
In the case that illegal or otherwise disreputable and unpopular activities become public, high-ranking officials may deny any awareness of such acts to insulate themselves and shift blame onto the agents who carried out the acts, as they are confident that their doubters will be unable to prove otherwise.
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The Daily Omnivore 