“The trouble with conspiracies is that they rot internally.”
Source: The Moon is a Harsh Mistress
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Robert A. Heinlein 557
American science fiction author 1907–1988Related quotes

Source: Vamps and Tramps (1994), "No Law in the Arena: A Pagan Theory of Sexuality", p. 47

Quotes 1990s, 1995-1999, Sovereignty and World Order, 1999
Context: ... the incompetence of intelligence agencies is legendary.… Just take Vietnam.… In the late 1940s, the United States was kind of unclear about which side to support.… In the case of Indochina, for whatever reason, they decided at one point to support France in its reconquest of Indochina. Well, at that point, essentially orders went to the U. S. intelligence communities, CIA and others, to demonstrate … that Ho Chi Minh and the Viet Minh were agents of either the Russians or the Chinese.… They couldn't do it. They couldn't find anything.… The conclusion in the State Department was, "OK, this proves that they're agents of the international communist conspiracy. Ho Chi Minh is such a loyal slave of"—pick it, Mao or Stalin—"that he doesn't even need orders.".

“I'm not a conspiracy theorist - I'm a conspiracy analyst.”
Quoted in The Guardian, by Ryszard Kapuściński, in "Vidal salon" https://www.theguardian.com/books/2007/may/05/featuresreviews.guardianreview14 (5 May 2007)
2000s

"The Mindscape of Alan Moore" (2003)
Context: The main thing that I learned about conspiracy theory is that conspiracy theorists actually believe in a conspiracy because that is more comforting. The truth of the world is that it is chaotic. The truth is, that it is not the Jewish banking conspiracy or the grey aliens or the 12 foot reptiloids from another dimension that are in control. The truth is more frightening, nobody is in control. The world is rudderless.

"The Mindscape of Alan Moore" (2003) http://themindscapeofalanmoore.com/index.html
Context: Yes, there is a conspiracy, in fact there are a great number of conspiracies that are all tripping each other up. And all of those conspiracies are run by paranoid fantasists and ham-fisted clowns. If you are on a list targeted by the CIA, you really have nothing to worry about. If however, you have a name similar to somebody on a list targeted by the CIA, then you are dead.

“Decency is Indecency’s Conspiracy of Silence.”
#126
1900s, Maxims for Revolutionists (1903)

Interview with Al Jazeera (27 March 2007)
Interviews

“All professions are conspiracies against the laity.”
Act I
1910s, The Doctor's Dilemma (1911)