HSRT Identifying Logical Fallacies 2 — Questions and Answers
Question 1: A physician argues: 'Either we prescribe this new expensive antibiotic, or the patient will die.' The patient has a mild urinary tract infection. This argument commits which fallacy?
- False dilemma — the argument artificially restricts options to two when multiple alternatives exist (Correct answer)
- Slippery slope — it assumes one action inevitably leads to a catastrophic outcome
- Ad hominem — it attacks the patient's decision-making
- Straw man — it misrepresents the actual clinical scenario
Correct answer: False dilemma — the argument artificially restricts options to two when multiple alternatives exist
A false dilemma presents only two options when more exist. For a mild UTI, multiple antibiotic options, watchful waiting, and other treatments are available.
The false dilemma (also called false dichotomy or either-or fallacy) artificially restricts the option space to two alternatives. In a mild UTI, there are multiple appropriate choices: first-line oral antibiotics (trimethoprim-sulfamethoxazole, nitrofurantoin, fosfomycin), watchful waiting in uncomplicated cases, hydration, and symptom management. Claiming the only options are an expensive new antibiotic or death misrepresents the clinical reality. Clinicians should recognize this pattern to avoid being manipulated by restrictive framings in clinical decision-making.
Question 2: During a team meeting, a senior surgeon says: 'I've done this procedure for 25 years without complications, so there's no need to update our protocol.' Which fallacy is this?
- Appeal to tradition — past practice is used to justify resistance to evidence-based updates (Correct answer)
- Appeal to authority — the surgeon's position is used to override committee decisions
- Hasty generalization — inferring all future cases from past personal experience
- Confirmation bias — selectively remembering successful cases
Correct answer: Appeal to tradition — past practice is used to justify resistance to evidence-based updates
Appealing to 'how it's always been done' as justification for not updating practice is the appeal to tradition fallacy.
The appeal to tradition fallacy holds that a practice is valid or correct simply because it has been done for a long time. In healthcare, this can be genuinely dangerous — many historical practices (e.g., routine episiotomy, use of thalidomide) were eventually found harmful. Evidence-based medicine requires periodic protocol review regardless of past success. Long experience is valuable expertise that should inform, not veto, evidence appraisal. The surgeon's personal complication rate (a small, potentially selected sample) cannot substitute for population-level research.
Question 3: A clinical ethics committee member argues: 'If we allow terminally ill patients to refuse treatment, soon doctors will be pressured to euthanize all elderly patients.' This argument exemplifies:
- Slippery slope — an unwarranted assumption that one action will inevitably lead to a series of extreme consequences (Correct answer)
- False dilemma — the argument presents only two extreme options
- Straw man — the argument misrepresents the committee's proposal
- Ad hominem — the argument attacks those who support patient autonomy
Correct answer: Slippery slope — an unwarranted assumption that one action will inevitably lead to a series of extreme consequences
A slippery slope argument assumes, without justification, that one action leads inevitably through a chain of events to a harmful extreme outcome.
The slippery slope fallacy involves claiming that allowing X will inevitably lead to Y, then Z, without providing justification for each step. In bioethics, respecting terminally ill patients' right to refuse treatment (a well-established legal and ethical principle) does not logically necessitate the outcomes described. Each step in the chain would require separate legal, ethical, and regulatory failures. The fallacy is not that slippery slope arguments are always wrong, but that they require justification for each inferential step — which is absent here.
Question 4: A nurse says to a patient: 'Dr. Smith is an expert in cardiology, so his recommendation that all patients should take aspirin daily must be correct.' This exemplifies:
- Appeal to authority — expertise in one domain does not make all claims in that domain automatically correct (Correct answer)
- Ad hominem — the argument uses the doctor's identity instead of evidence
- Bandwagon fallacy — the claim implies everyone agrees with Dr. Smith
- False analogy — comparing aspirin use across different patient populations
Correct answer: Appeal to authority — expertise in one domain does not make all claims in that domain automatically correct
While expertise is a factor in credibility, inferring that a statement must be correct simply because an expert said it is an appeal to authority.
Appeal to authority (argumentum ad verecundiam) involves accepting a claim as true solely because an authority figure made it, without examining the evidence. Expertise increases the prior probability that a claim is correct, but does not guarantee it. Dr. Smith's expertise does not eliminate the need to check guidelines — daily aspirin has well-documented harms (GI bleeding, hemorrhagic stroke) and is NOT recommended for primary prevention in most patients. Expert opinion is one input in evidence appraisal, not a substitute for it.
Question 5: A hospital administrator argues against hiring more night nurses: 'The last nurse we hired for nights called in sick three times in two months. You can see why night nurses are unreliable.' This commits which fallacy?
- Hasty generalization — drawing a broad conclusion about all night nurses from a single case (Correct answer)
- Straw man — misrepresenting the argument for hiring more nurses
- Ad hominem — attacking the character of the nurse in question
- False dilemma — presenting only two staffing options
Correct answer: Hasty generalization — drawing a broad conclusion about all night nurses from a single case
Generalizing from one data point (one nurse's absenteeism) to an entire category (all night nurses) is a hasty generalization.
Hasty generalization involves inferring a general rule from an insufficient or unrepresentative sample. One nurse's absenteeism history cannot characterize the reliability of all night nurses as a group. Absenteeism patterns depend on individual health, personal circumstances, management quality, and scheduling systems. Statistical analysis across multiple staff over longer periods would be needed to establish any generalizable claim. This fallacy can lead to unjust hiring discrimination and poor workforce management decisions.
Question 6: During a clinical debate, a colleague says: 'You think we should reduce antibiotic prescribing, but you also took antibiotics last year. You're a hypocrite.' This is an example of:
- Ad hominem (tu quoque) — attacking the person's alleged inconsistency rather than addressing the argument (Correct answer)
- Straw man — misrepresenting the argument for reduced prescribing
- Appeal to hypocrisy — a valid refutation when the speaker violates their own standards
- False analogy — comparing personal antibiotic use to prescribing policy
Correct answer: Ad hominem (tu quoque) — attacking the person's alleged inconsistency rather than addressing the argument
Tu quoque ('you too') attacks the speaker's personal behavior rather than addressing the substance of the argument, which is a form of ad hominem.
The tu quoque fallacy attacks the messenger rather than the message. Even if the colleague did take antibiotics personally, this does not logically negate the evidence for antibiotic stewardship — antimicrobial resistance is a population-level problem supported by extensive microbiological and epidemiological data. A person's private behavior does not invalidate their logical arguments. In health policy debates, logical fallacies like tu quoque derail evidence-based discourse. Arguments should be evaluated on their merits, not the personal history of those making them.
HSRT Identifying Logical Fallacies 2
A physician argues: 'Either we prescribe this new expensive antibiotic, or the patient will die.' The patient has a mild urinary tract infection.
This argument commits which fallacy?