Ad hominem

Ad Hominem Hannah

“Never mind the argument. Look who's making it.”

What's the problem?

An ad hominem argument rejects a claim or argument because of something about the person making it (their character, appearance, background, motives or past) when that trait doesn't bear on whether the claim is true or the reasoning sound. Facts about a person are sometimes relevant. When we rely on someone's testimony, their opportunity to observe and their record of honesty matter. When we defer to expertise, their qualifications matter. A financial stake is a conflict of interest that justifies closer scrutiny. And when the question is about someone's own conduct, that conduct is the topic. Even relevant concerns don't automatically disprove a conclusion: they change how much weight to give someone's word, not whether an argument that stands on its own evidence is sound. Harsh or rude criticism of reasoning isn't ad hominem either; it may be unkind, but it addresses the argument. The test: is a personal fact being used in place of engaging with the claim, when it can't settle the claim? Hannah asks whether the person is being attacked instead of the argument; Straw Man Stan asks whether the argument was misrepresented.

Context: At a staff meeting, Priya presents incident records showing the night shift logged twice as many safety incidents as the day shift last quarter. No figures on hours worked or staffing per shift are supplied. A coworker responds below.

✗ Attacks the person

Priya's only been here six months, so we can ignore her numbers.

✓ Relevance weighed

Her short tenure alone doesn't refute these records; we can examine how they were collected. The counts also don't show risk per hour until we compare how much work each shift covers.

Why it works

Short tenure can matter when someone reports firsthand familiarity, but these records can be checked independently of who presents them. The revision examines the data instead, and treats twice as many incidents as a count, not as doubled risk.