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An association fallacy is an informal inductive fallacy of the hasty-generalization or red-herring type and which asserts, by irrelevant association and often by appeal to emotion, that qualities of one thing are inherently qualities of another. Two types of association fallacies are sometimes referred to as guilt by association and honor by association.


A Venn diagram illustrating the association fallacy. Although A is within B and is also within C, not all of B is within C.
A Venn diagram illustrating the association fallacy. Although A is within B and is also within C, not all of B is within C.

In notation of first-order logic, this type of fallacy can be expressed as (x  S : φ(x)) ⇒ (x ∈ S : φ(x)), meaning "if there exists any x in the set S so that a property φ is true for x, then for all x in S the property φ must be true."

Premise: A is a B
Premise: A is also a C
Conclusion: Therefore, all Bs are Cs

The fallacy in the argument can be illustrated through the use of an Euler diagram: "A" satisfies the requirement that it is part of both sets "B" and "C", but if one represents this as an Euler diagram, it can clearly be seen that it is possible that a part of set "B" is not part of set "C", refuting the conclusion that "all Bs are Cs".

Guilt by association

Further information on legal and ethical aspects: Collective guilt

Further information: Ad hominem


Some syllogistic examples of guilt by association:

Guilt by association as an ad hominem fallacy

Guilt by association can sometimes also be a type of ad hominem fallacy, if the argument attacks a person because of the similarity between the views of someone making an argument and other proponents of the argument.[1][2]

This form of the argument is as follows:

An example of this fallacy would be "My opponent for office just received an endorsement from the Puppy Haters Association. Is that the sort of person you would want to vote for?"

Honor by association

Further information: pro hominem

The counterpart of "guilt by association" is honor by association, where one claims that someone or something must be reputable because of the people or organizations that are related to it or otherwise support it.[2]


Galileo gambit

A form of the association fallacy often used by those denying a well-established scientific or historical proposition is the so-called Galileo gambit.[3] The argument runs thus: Galileo was ridiculed in his time for his scientific observations, but was later acknowledged to be right; the proponent argues that since their non-mainstream views are provoking ridicule and rejection from other scientists, they will later be recognized as correct, like Galileo.[4] The gambit is flawed in that being ridiculed does not necessarily correlate with being right and that many people who have been ridiculed in history were, in fact, wrong.[3][5] Similarly, Carl Sagan has stated that people laughed at geniuses such as Columbus and the Wright Brothers, but "they also laughed at Bozo the Clown".[6][7]

See also


  1. ^ Labossiere, Michael C. (12 June 2014). "Fallacy: Guilt By Association". The Nizkor Project. Archived from the original on 4 October 2018. Retrieved 12 June 2014.
  2. ^ a b Damer, T. Edward (21 February 2008). "6: Fallacies that Violate the Relevance Criterion". Attacking Faulty Reasoning: A Practical Guide to Fallacy-Free Arguments (6th ed.). Cengage Learning. p. 112. ISBN 978-1-111-79919-9.
  3. ^ a b Collins, Loren (30 October 2012). Bullspotting: Finding Facts in the Age of Misinformation. Prometheus Books. pp. 27–28. ISBN 978-1-61614-635-1.
  4. ^ Amsden, Brian. "Recognizing Microstructural Fallacies" (PDF). p. 22. Retrieved 24 March 2014.
  5. ^ Gorski, David (28 March 2005). The Galileo Gambit. Respectful Insolence. Archived from the original on 28 February 2018.
  6. ^ Shapiro, Fred R. (2006). The Yale Book of Quotations. Yale University Press. pp. 660. ISBN 9780300107982.
  7. ^ Sagan, Carl (1979). Broca's Brain: Reflections on the Romance of Science. Random House. p. 64. ISBN 9780394501697.

General and cited references