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What Is the Argumentum ad Logicam Fallacy?
Argumentum ad logicam assumes that because an argument contains a logical fallacy, its conclusion must be false. A poorly constructed argument can still reach a true conclusion — the reasoning is flawed, but the claim might be correct for other reasons.
Also known as Fallacy Fallacy, this is a informal fallacy — the error lies in the content or context of the argument rather than its formal structure.
How to Spot It
Example
"Your argument for exercise being healthy contains an appeal to authority, so exercise must not actually be healthy." The fallacy in the argument doesn't negate decades of medical research.
A Stronger Version
"Your argument cited a celebrity trainer rather than research, which is an appeal to authority. But exercise's health benefits are well-established through thousands of clinical studies."
Warning Signs
- Assuming a fallacious argument means a false conclusion
- Dismissing claims solely because one argument for them was flawed
- Treating fallacy detection as disproof
- Ignoring that the conclusion may have other valid support
How to Fix It
Finding a fallacy in an argument shows the argument is flawed, not that the conclusion is wrong. The conclusion might still be true — it just needs better evidence. Separate the quality of the argument from the truth of the conclusion.
Paste your text above to scan for argumentum ad logicam fallacy patterns and other reasoning errors. Each flagged passage includes an explanation and a suggestion for making the argument stronger.
Related Tools
Try our grammar checker to catch errors automatically, or use the paraphrasing tool to improve sentence clarity.