Fallacy · Changing the subject
Genetic fallacy
Also called: Judging by origin, motive fallacy
Judging a claim by where it came from or why someone holds it, rather than by the evidence.
What it is
Where an idea comes from, or what someone gains by believing it, is not the same as whether it is true. A company that profits from a finding may still be right, and a cherished family remedy may still be useless. The origin is a reason to check, not a verdict.
An example
“Of course the solar company says panels pay for themselves. They sell panels.” The motive is real, but the numbers can be checked, and they decide the matter.
How to spot it
The argument stops at the source or the motive and never reaches the evidence.
How to answer it
“That’s a good reason to look closely. What do the figures show?”
When it is not a fallacy
Origin is relevant when we have nothing to go on but someone’s word. A source with a stake in the answer deserves less trust until its claim is checked.
Printable sheet of all fallacies
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A plain reference you can paste into notes or an essay:
Quest2Reason. “Genetic fallacy.” https://quest2reason.com/learn/ideas/fallacies/genetic-fallacy. Accessed 13 November 2026.