False Dichotomy and False Equivalence

Some of the most effective fallacies work by distorting the range of options available or by misrepresenting how different things compare. The false dichotomy presents only two options when more exist, whilst false equivalence treats significantly different things as though they are the same. Both appear frequently in the kinds of opinion pieces and policy arguments you will encounter on the LNAT.

---

False Dichotomy (False Dilemma)

A false dichotomy is committed when an argument presents only two options as though they are the only possibilities, when in fact there are other viable alternatives.

Structure

Step	What happens
1. Two options presented	"Either we do X or we do Y"
2. One option rejected	"Y would be unacceptable because..."
3. Conclusion	"Therefore we must do X"
Hidden reality	Options Z, W, and V also exist but are ignored

Example

"We must either maintain strict grammar school selection or accept that all children will receive an identical, one-size-fits-all education. Since one-size-fits-all education fails to meet the needs of gifted children, grammar schools are essential."

This presents only two options: grammar school selection or identical education for all. In reality, there are many other models — comprehensive schools with setting by ability, specialist schools, mixed-ability teaching with differentiated tasks, and numerous other approaches. The argument ignores these alternatives.

---

Why False Dichotomies Are Persuasive

False dichotomies exploit a cognitive preference for simplicity. Complex issues with multiple possible solutions are reduced to a binary choice, making the "right" answer seem obvious.

They are particularly common in:

• Political debate — "You are either with us or against us"
• Policy discussions — "We either fund defence or fund healthcare"
• Ethical arguments — "If we allow X, we must allow everything"
• Media commentary — "The choice is between freedom and safety"

LNAT Tip: Whenever a passage frames a decision as an either/or choice, ask yourself: "Are these really the only two options?" If you can think of a plausible third option, the argument may be committing a false dichotomy.

---

Recognising False Dichotomies in LNAT Passages

Signal phrases

Phrase	Example
"Either... or..."	"Either we ban social media or we accept cyberbullying"
"The only option is..."	"The only option is to increase taxes"
"We have no choice but to..."	"We have no choice but to privatise the NHS"
"The choice is between..."	"The choice is between economic growth and environmental protection"
"If we do not X, then Y"	"If we do not deport all illegal immigrants, the system will collapse"

Worked Example

"Britain faces a stark choice on immigration. Either we maintain open borders and accept the resulting pressure on public services, housing, and wages, or we take back control and impose strict limits on the number of people entering the country each year. The strain on the NHS and schools is already at breaking point. The answer is clear."

Question: Which of the following best describes a flaw in the argument?

A. It provides no evidence that immigration puts pressure on public services. B. It presents only two extreme options — completely open borders or strict numerical limits — while ignoring more moderate approaches such as managed migration, points-based systems, or sector-specific controls. C. It fails to acknowledge the economic benefits of immigration. D. It is biased against immigrants.

Answer: B. The passage frames immigration policy as a binary choice between two extremes, ignoring the wide range of intermediate approaches that most actual immigration policies represent.

---

False Equivalence

A false equivalence is committed when an argument treats two things as comparable or equivalent when they differ in ways that are significant to the conclusion.

Structure

Step	What happens
1. Two things are compared	"X is like Y" or "X and Y are both Z"
2. A conclusion is drawn from the comparison	"Since Y has property P, X must also have P"
Hidden reality	X and Y differ in ways that make the comparison misleading

Example

"Banning cigarette advertising is the same as banning all forms of commercial speech. If we accept one, we must accept the other."

Cigarette advertising and other commercial speech differ in a crucial respect: cigarettes are a product that directly and significantly harms health when used as intended. The comparison ignores this critical difference, making the equivalence false.

---

How False Equivalence Appears in Arguments

1. Inappropriate analogies

"Requiring people to wear seatbelts is just like requiring them to eat five portions of fruit and vegetables a day. Both interfere with personal freedom."