F036 • Informal - Relevance
Also known as: Circumstantial Ad Hominem, Appeal to Motive, Poisoning the Well, Conflict of Interest Fallacy
Sometimes the most satisfying way to dismiss an argument is to explain why the person would say it. 'Of course they think that -- look at their situation.' It feels like insight. It feels like you have seen through the argument to the motive behind it. But explaining why someone might believe something is not the same as showing that what they believe is wrong.
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Looking for motives behind arguments is a deeply practical skill. We live in a world full of interested parties, and noticing that someone has a stake in a particular outcome is genuinely useful information. The pattern becomes misleading when the motive explanation is treated as the complete response -- when 'they have a reason to say this' becomes 'and therefore it is not true.' A person with a financial interest in a policy can still present sound evidence for it. A scientist funded by an interested party can still produce valid research. The motive tells you to look more carefully at the evidence; it does not tell you what you will find when you look. The subtle version of this pattern is especially hard to catch, because it feels like you are being appropriately skeptical when you are actually being dismissive.
| Considering circumstances is legitimate when evaluating the weight to give testimonial evidence, assessing whether proper disclosures have been made, or determining whether additional verification is warranted. |
| For example, knowing a study was funded by an interested party is relevant information for assessing potential bias in methodology or interpretation, even if it doesn't automatically invalidate the findings. |
| You catch yourself saying or thinking 'of course they would say that' -- and realize it felt like a complete response when it was actually just the beginning of one |
| You find that knowing someone's circumstances or affiliations changed your assessment of their argument before you finished evaluating the argument itself |
| You notice that pointing out a motive feels like winning the argument, even though motives and conclusions are different things |
| You use phrases like 'follow the money' or 'consider who benefits' as endings rather than as starting points for deeper investigation |
| Thinking that pointing out bias or conflicts of interest is always fallacious -- sometimes these genuinely affect the reliability of testimony, and noting them is appropriate as long as it leads to scrutiny rather than dismissal |
| Failing to recognize the difference between adjusting how carefully you examine a claim (appropriate) and rejecting the claim without examination (fallacious) |
| Missing the fact that you yourself have circumstances and motives that affect your reasoning -- the pattern is easiest to spot in others and hardest to notice in yourself |
| Ad Hominem Circumstantial |
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| Dismissing someone's argument by pointing to their circumstances, situation, affiliations, or potential motives rather than addressing the argument's merits. |
| A person's circumstances or potential biases don't automatically invalidate their arguments. The argument should be evaluated on its own logical and evidential merits, not on assumptions about why the person might be making it. Even someone with a clear bias can present valid evidence and sound reasoning that should be assessed independently. |
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