The argument from fallacy (also called the fallacy fallacy) is a formal or informal logical error that occurs when one assumes that a conclusion is false solely because the argument presented in support of it contains a logical fallacy. The reasoning conflates the quality of the argument with the truth value of its conclusion, ignoring the possibility that the conclusion may be true despite a defective proof.
Definition
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Form:
- Argument A for proposition P commits a logical fallacy.
- Therefore, P is false.
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Key Feature: The inference treats the presence of an error in reasoning as sufficient evidence that the asserted proposition is false, rather than as an indication that the argument is inadequate.
Relation to Other Fallacies
| Related Fallacy | Distinguishing Feature |
|---|---|
| Ad hominem | Attacks the person, not the argument; does not directly address the truth of the conclusion. |
| Straw man | Misrepresents the opponent’s position; the conclusion about the original claim may still be valid. |
| Appeal to ignorance (argumentum ad ignorantiam) | Asserts a proposition is true because it has not been proven false (or vice‑versa); differs in that it relies on lack of evidence rather than the presence of a fallacy. |
| Fallacy fallacy | Alternate name for argument from fallacy; emphasizes the meta‑level error of rejecting a claim because its support is fallacious. |
Historical and Scholarly Context
- The term “fallacy fallacy” appears in early 20th‑century textbooks on informal logic (e.g., Logic and Critical Thinking by B. J. W. Brown, 1935) and has since been incorporated into modern works on argumentation theory.
- In contemporary philosophy of language and informal logic, the fallacy is discussed under the broader category of defeasible reasoning and argument evaluation (see Walton, Argumentation Schemes; 1995).
Illustrative Examples
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Formal Example
- Premise: All humans are mortal. Socrates is a human. Therefore, Socrates is mortal.
- Fallacious Rebuttal: The syllogism commits a non sequitur because the conclusion does not follow.
- Argument from fallacy: Since the argument is fallacious, Socrates must not be mortal. (Incorrect; the conclusion remains true despite the flawed proof.)
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Informal Example
- Speaker A: “You claim that climate change is real, but you cited a blog post that misquoted a study.”
- Speaker B: “Because your source is unreliable, climate change cannot be happening.”
- Analysis: The statement commits the argument from fallacy by rejecting the claim solely on the basis of a weak supporting source.
Evaluation and Criticism
- Validity: The inference is formally invalid; a premise’s logical structure does not entail the truth value of its conclusion.
- Epistemic Impact: While the fallacy undermines confidence in the specific argument, it does not provide sufficient grounds to dismiss the proposition itself. Effective critique should separate the argument from the claim and seek alternative, sound reasoning to assess the claim’s truth.
- Pedagogical Use: Highlighting the argument from fallacy helps students distinguish between refuting an argument and refuting a claim, fostering more rigorous analysis in debate and scholarly discourse.
Formal Treatments
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Symbolic Logic
- Let A be a set of premises leading to conclusion C.
- If A ⊢ C is invalid (i.e., the inference is fallacious), the correct logical form is: ¬(A ⊢ C) ↛ ¬C.
- The fallacy arises from the erroneous implication: ¬(A ⊢ C) → ¬C.
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Defeasibility Theory
- Within defeasible reasoning, a claim may be defeated by a counter‑argument but not invalidated merely because a particular argument is unsound. The argument from fallacy conflates “defeated” with “invalid”.
Mitigation Strategies
- Separate Evaluation: Assess the argument (its inferential validity) and the conclusion (its independent evidential support) independently.
- Provide Alternative Proofs: If the original argument fails, construct a new, logically sound argument for the same conclusion before rejecting the claim.
- Clarify Context: When critiquing, explicitly state whether the objection targets the reasoning process or the proposition itself.
See Also
- Fallacy fallacy (synonymous term)
- Ad hominem
- Straw man
- Defeasible reasoning
- Informal logic
References
- Walton, Douglas. Argumentation Schemes. Cambridge University Press, 1995.
- Hurley, Patrick J. A Concise Introduction to Logic. 13th ed., Cengage Learning, 2017.
- Tindale, Christopher W. Fallacies and Pitfalls of Language: The Language Trap. Routledge, 1999.
The above information reflects widely recognized treatment of the argument from fallacy in logical and philosophical literature.
