Within Labels
When Bad Arguments Still Reach True Claims
A bad reason can fail to prove a claim without making the opposite claim true.
On this page
- Why support and truth are different questions
- Train strike and public health examples
- How to say not proved without saying false
Page outline Jump by section
Introduction
A weak argument and a false conclusion are not the same thing. This distinction sits at the heart of understanding logical fallacies and avoiding the fallacy fallacy. When an argument contains a reasoning error, the most that has been shown is that the argument fails to establish its conclusion. The conclusion itself may still be true for entirely different reasons. Philosophers and logicians generally treat fallacies as defects in reasoning rather than automatic proof that a claim is false. [Internet Encyclopedia of Philosophy]iep.utm.eduInternet Encyclopedia of PhilosophyFallaciesOne widely accepted definition defines a fallacious argument as one that either is deductivel… [Stanford Encyclopedia of Philosophy]plato.stanford.eduEncyclopedia of Philosophy FallaciesStanford Encyclopedia of PhilosophyFallacies - Stanford Encyclopedia of Philosophyby H Hansen · 2015 · Cited by 427 — Two competing conce…
This matters because debate often goes wrong at exactly this point. Someone identifies a fallacy, then immediately jumps from “that argument is bad” to “therefore the claim is false”. The proper conclusion is usually much narrower: the claim has not been adequately proved by that argument. Whether the claim is true remains a separate question requiring further evidence. [PhilArchive]philarchive.orgPhilArchiveThe Fallacy FallacyNovember 2, 2022 — by A Aberdein · 2023 · Cited by 7 — Abstract The fallacy fallacy is either the misdiagno…
Why Support and Truth Are Different Questions
The key mechanism is simple. Arguments and conclusions are evaluated on different dimensions.
- A conclusion is either true or false.
- An argument is either strong or weak, valid or invalid, persuasive or unpersuasive.
These assessments overlap but are not identical. A person can arrive at a true belief through poor reasoning, just as someone can use excellent reasoning while starting from false premises and reach a false conclusion. Logic evaluates the connection between reasons and claims; it does not guarantee that every badly supported claim is wrong. [Internet Encyclopedia of Philosophy]iep.utm.eduInternet Encyclopedia of PhilosophyFallaciesOne widely accepted definition defines a fallacious argument as one that either is deductivel… [Philosophy Home Page]philosophy.lander.eduPhilosophy Home PageThe Nature of FallaciesA fallacy is a mistake in reasoning: an argument which either does not prove, or does not prov…
Consider a simple example:
“The city will experience heavy rain tomorrow because my left knee hurts.”
The reasoning is weak. The state of someone’s knee does not reliably predict weather. Yet it is entirely possible that heavy rain will occur the next day. The prediction could be correct by coincidence. The argument fails, but the conclusion might still match reality.
This is why identifying a fallacy does not settle the factual question. It settles only the argumentative question: whether the stated reasons successfully support the claim. [Wikipedia]WikipediaArgument from fallacyArgument from fallacy
Train-Strike and Public-Health Examples
Concrete cases make the distinction easier to see.
The Train-Strike Example
Suppose someone argues:
“Everyone in my office says the train strike will happen, so the train strike will happen.”
If the office workers have no special knowledge, this is weak evidence. The argument relies on opinion rather than direct information.
However, the strike may still occur. Union negotiators could later announce a walkout. Rail operators could confirm service disruption. News reports could verify the prediction.
The flaw is not in the conclusion itself. The flaw is in the route used to reach it. Rejecting the argument does not justify predicting that no strike will happen. It merely shows that better evidence is needed.
The Public-Health Example
Imagine someone says:
“This health recommendation must be correct because a celebrity supports it.”
The celebrity’s endorsement is not strong evidence. Expertise matters more than fame when evaluating medical claims.
Yet the recommendation could still be sound. If clinical studies and public-health agencies independently support the same recommendation, then the conclusion may be true despite the poor argument offered on its behalf.
In both examples, the reasoning fails to do the work assigned to it. The conclusion survives or falls based on separate evidence, not on the weakness of the original argument. This reflects a central insight in argumentation theory: exposing a fallacy undercuts a particular line of support, not necessarily the proposition being supported. [Internet Encyclopedia of Philosophy]iep.utm.eduInternet Encyclopedia of PhilosophyFallaciesOne widely accepted definition defines a fallacious argument as one that either is deductivel… [PhilArchive]philarchive.orgPhilArchiveThe Fallacy FallacyNovember 2, 2022 — by A Aberdein · 2023 · Cited by 7 — Abstract The fallacy fallacy is either the misdiagno…
How Coincidence Creates True Conclusions from Bad Arguments
Many people instinctively assume that bad reasoning should produce false beliefs. Real life is messier.
A conclusion can turn out to be true because:
- The person guessed correctly.
- The conclusion was already true before the argument was made.
- The argument used the wrong evidence for a claim that happened to be correct.
- Other, unstated reasons support the conclusion even though the stated reasons do not.
This possibility is well recognised in discussions of logical fallacies. A fallacious argument can have a true conclusion; what makes it fallacious is the failure of the reasoning, not the eventual truth value of the claim. [Internet Archive]archive.orgInternet ArchiveList of fallaciesArgument from fallacy – assumes that if an argument for some conclusion is fallacious… While the con… [Wikipedia For example:]WikipediaArgument from fallacyArgument from fallacy
“Jackson is a mammal; therefore Jackson is a human.”
The inference is invalid. Many mammals are not humans. Yet if Jackson actually is a human, the conclusion happens to be true. The argument remains defective because the premises do not adequately establish that conclusion. [Internet Archive]archive.orgInternet ArchiveList of fallaciesArgument from fallacy – assumes that if an argument for some conclusion is fallacious… While the con…
How to Say “Not Proved” Without Saying “False”
One of the most useful habits in critical thinking is learning to separate criticism of an argument from criticism of a claim.
Instead of saying:
> “That argument is a fallacy, so the conclusion is false.”(#endnote-3 “Endnote 3”) [Wikipedia]WikipediaArgument from fallacyArgument from fallacy
A more accurate response is:
> “That argument does not successfully establish the conclusion.” [archive.org]archive.orgInternet ArchiveList of fallaciesArgument from fallacy – assumes that if an argument for some conclusion is fallacious… While the con…
Or:
“The conclusion may be true, but this reasoning does not show that it is true.”
This shift sounds subtle, but it changes the entire discussion. It keeps attention on what has actually been demonstrated rather than on what someone assumes follows from identifying a fallacy.
A related danger is treating the mere accusation of a fallacy as sufficient refutation. Contemporary discussions of the fallacy fallacy note that critics sometimes leap from spotting a supposed error in reasoning to dismissing an entire position. The proper next step is usually to examine alternative evidence, not to declare the issue settled. [PhilArchive]philarchive.orgPhilArchiveThe Fallacy FallacyNovember 2, 2022 — by A Aberdein · 2023 · Cited by 7 — Abstract The fallacy fallacy is either the misdiagno…
The Practical Value of the Distinction
Understanding the difference between a bad argument and a false conclusion improves reasoning in two ways.
First, it encourages intellectual caution. Finding a flaw in someone’s reasoning may justify withholding belief, but it does not automatically justify believing the opposite.
Second, it encourages evidence-seeking. Once a weak argument has been identified, the important question becomes: what evidence actually bears on the claim? The discussion moves away from labels and toward facts.
That is why fallacy labels are most useful as diagnostic tools. They help answer whether a particular argument works. They do not, by themselves, answer what is true. A bad argument may fail completely as proof while still pointing, by accident or for unstated reasons, toward a conclusion that happens to be correct. [Wikipedia+3Internet Encyclopedia of Philosophy+3Stanford Encyclopedia of Philosophy]
Amazon book picks
Further Reading
Books and field guides related to When Bad Arguments Still Reach True Claims. Use these as the next step if you want deeper reading beyond the article.
A Rulebook for Arguments
Directly addresses how conclusions and supporting arguments should be evaluated separately.
Being Logical
Explains why faulty reasoning does not automatically determine a conclusion's truth value.
Thinking, Fast and Slow
Shows how people can reach correct or incorrect conclusions through flawed processes.
The Art of Reasoning
Focuses on argument quality rather than merely judging conclusions.
eBay marketplace picks
Marketplace Samples
Example marketplace items related to this page. Use the search link to explore similar finds on eBay.
Endnotes
-
Source: plato.stanford.edu
Title: Encyclopedia of Philosophy Fallacies
Link: https://plato.stanford.edu/entries/fallacies/Source snippet
Stanford Encyclopedia of PhilosophyFallacies - Stanford Encyclopedia of Philosophyby H Hansen · 2015 · Cited by 427 — Two competing conce...
-
Source: philarchive.org
Link: https://philarchive.org/archive/ABETFF-2Source snippet
PhilArchiveThe Fallacy FallacyNovember 2, 2022 — by A Aberdein · 2023 · Cited by 7 — Abstract The fallacy fallacy is either the misdiagno...
Published: November 2, 2022
-
Source: Wikipedia
Title: Argument from fallacy
Link: https://en.wikipedia.org/wiki/Argument_from_fallacy -
Source: archive.org
Link: https://archive.org/download/ThinkingFallacies/ThinkingFallacies-Part1.pdfSource snippet
Internet ArchiveList of fallaciesArgument from fallacy – assumes that if an argument for some conclusion is fallacious... While the con...
-
Source: Wikipedia
Title: List of fallacies
Link: https://en.wikipedia.org/wiki/List_of_fallaciesSource snippet
List of fallaciesA fallacy is the use of invalid or otherwise faulty reasoning in the construction of an argument. All forms of human...
-
Source: youtube.com
Link: https://www.youtube.com/watch?v=oGBO-WMrlIQSource snippet
How do Beliefs Work? (Fallacy Fallacy)...
-
Source: iep.utm.edu
Link: https://iep.utm.edu/fallacy/Source snippet
Internet Encyclopedia of PhilosophyFallaciesOne widely accepted definition defines a fallacious argument as one that either is deductivel...
-
Source: philosophy.lander.edu
Link: https://philosophy.lander.edu/logic/nature_fall.htmlSource snippet
Philosophy Home PageThe Nature of FallaciesA fallacy is a mistake in reasoning: an argument which either does not prove, or does not prov...
-
Source: britannica.com
Link: https://www.britannica.com/topic/fallacySource snippet
Encyclopedia BritannicaFallacy | Logic, Definition & Examples13 May 2026 — An argument may be fallacious in three ways: in its material c...
Published: May 2026
-
Source: biostim.com.au
Link: https://biostim.com.au/logical-fallacies/the-fallacy-fallacy/?srsltid=AfmBOoqy-3_3gf0i10rQFZaQO639yHCMya0uiJtvsYnyjPZRRtMZJpBKSource snippet
BioStimIt replaces analysis with intellectual shortcutting. · It confuses argument quality with truth value. · It shuts down legitimate d...
Additional References
-
Source: logicallyfallacious.com
Link: https://www.logicallyfallacious.com/logicalfallacies/Pseudo-Logical-FallaciesSource snippet
Pseudo-Logical FallaciesAppeal to Convenience: Accepting an argument because its conclusion is convenient, not necessarily true. This fal...
-
Source: actuary.org
Title: Here is a description of the most common types.Read more
Link: https://actuary.org/article/irrationally-yours-an-introduction-to-logical-fallacies/Source snippet
Irrationally Yours—An Introduction to Logical Fallacies1 Mar 2021 — Logical fallacies are, at best, flawed logic, but more commonly are i...
-
Source: lindsey.edu
Link: https://www.lindsey.edu/academics/img/writing-center-pdfs/introduction-fallacies.pdfSource snippet
Introduction to FallaciesA fallacy is an illogical step in the formulation of an argument. An argument in academic writing is essentially...
-
Source: qcc.cuny.edu
Title: Arguments Fallacies
Link: https://www.qcc.cuny.edu/socialSciences/ppecorino/ss610/Arguments-Fallacies.htmlSource snippet
FALLACIESA fallacy is a kind of error in reasoning. The list of fallacies found here Partial List of Fallacies contains 231 names of the...
-
Source: youtube.com
Title: Argument from Fallacy
Link: https://www.youtube.com/watch?v=tIRTfzPZ17YSource snippet
Fallacy 7 #logic #fallacyThe argument from fallacy (or the "fallacy fallacy"): reasoning that because an argument contains a fallacy, it...
-
Source: philosophy.stackexchange.com
Title: question on fallicious argument [appeal to popularity]({{ ‘popularity/’ | relative_url }})
Link: https://philosophy.stackexchange.com/questions/84380/question-on-fallicious-argument-appeal-to-popularitySource snippet
Take these 2 arguments: When walking downtown, the majority of...
-
Source: link.springer.com
Link: https://link.springer.com/article/10.1007/s11245-022-09872-4Source snippet
from Popularity: Their Merits and Defects in...by JA van Laar · 2023 · Cited by 2 — I define the concept of an argument from popularity...
-
Source: youtube.com
Link: https://www.youtube.com/watch?v=lmamo8mE0NkSource snippet
31 logical fallacies in 8 minutes...
-
Source: youtube.com
Title: What Bad Arguments Prove & Why
Link: https://www.youtube.com/watch?v=e69OECc4AlQSource snippet
Truth and validity | Critical thinking...
-
Source: youtube.com
Title: 31 logical fallacies in 8 minutes
Link: https://www.youtube.com/watch?v=Qf03U04rqGQ
Topic Tree