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The informal fallacy of 'false dilemma'—also known as 'false choice', 'false dichotomy', 'falsified dilemma', 'fallacy of the excluded middle', 'black and white thinking', 'false correlative', 'either/or fallacy', and 'bifurcation'—involves a situation in which two alternative statements are held to be the only possible options, when in reality there exist one or more other options which have not been considered.
The dilemma need not be limited to two choices; it may involve three possibilities, in which case it is known as a 'trifurcation'. There may be even more choices involved, in which case the fallacy may arise simply by accidental omission—possibly through a form of wishful thinking—rather than by deliberate deception.
When two alternatives are presented, they are often, though not always, two extreme points on some spectrum of possibilities. This can lend credence to the larger argument by giving the impression that the options are mutually exclusive, even though they need not be. Furthermore, the options are typically presented as being collectively exhaustive, in which case the fallacy can be overcome, or at least weakened, by considering other possibilities, or perhaps by considering the whole spectrum of possibilities, as in fuzzy logic.

Contents

Examples

Morton's Fork

False choice

Black and white thinking

There is no alternative

See also

References

Examples

A simple example of a false dilemma is the following:
:"You are either with us or against us. You have refused to join our cause, therefore you must be working against our cause."
This argument is a false dilemma, because it denies the possibility that there is someone who has no interest or is unaware of that cause.

Morton's Fork

Very often a Morton's Fork, a choice between two equally unpleasant options, is a false dilemma. The phrase originates from an argument for taxing English nobles:
: ''"Either the nobles of this country appear wealthy, in which case they can be taxed for good; or they appear poor, in which case they are living frugally and must have immense savings, which can be taxed for good."'' ^[2]
This is a false dilemma, because some members of the nobility may in fact lack liquid assets.

False choice

The presentation of a ''false choice'' often reflects a deliberate attempt to eliminate the middle ground on an issue. Rhetorically, this often takes the form of a statement such as the statement by U. S. President George W. Bush:
: "''Either you are with us, or you are with the terrorists.''"^[3]
Such false choices are common in politics. Another example is the following quote from John Kerry's web page:
: By raising funds for their as-yet unnamed Democratic opponents, our Roadblock Republicans campaign increases political pressure on those Republicans who continue to place loyalty to George W. Bush above our national security and the lives of our men and women serving in Iraq. ^[4]
False choices are often put in the form of rhetorical questions, as is the case with this question by Ralph Nader.
: "Which Party is on the offensive and which Party is on the defensive?" ^[5]
The choice is false, since any political party will take the offensive on some issues and take a defensive stance on other issues.

Black and white thinking

A common form of the false dilemma in public discourse is 'black and white thinking'. As an example, consider the following three patterns of reasoning, the first valid, the others invalid.

★ Example 1: Three is an odd number. Only even numbers are divisible by two. Therefore three is not divisible by two. (valid)

★ Example 2: John says that three is an odd number. John is a liar. Therefore three is not an odd number. (invalid)

★ Example 3: John says that two is an odd number. John is a liar. Therefore two is not an odd number. (invalid)
The first example is valid because natural numbers are either even or odd. The two classes are exhaustive and mutually exclusive. The second example is invalid because the categories "liar" and "truth teller" are neither exhaustive nor mutually exclusive. Anyone may tell some lies and some truths. The third example is invalid reasoning for the same reason as the second (even though its conclusion is true).

There is no alternative

The assertion that there is no alternative is an example of the false dichotomy taken to its ultimate extreme, in which the alternatives are reduced to one, the proposal of the speaker. Of course the speaker does not believe there are no alternatives othewise he would not bother to argue the point; rather he opposes the alternatives and seeks to dismiss them by denying their existence.
"This was the mantra chanted by 'dries' during the prime ministerial reign of Margaret Thatcher, by which they demonstrated their belief that free-market capitalism was the only possible economic theory. It was said so often amongst them that it was shortened to TINA. The hard-right Thatcherites called themselves 'dries' to demonstrate their opposition to the 'wets', i.e. the One-Nation Tories whom Thatcher despised. Wet was the public school nickname for any boy who showed any sign of caring for his fellow beings." http://www.phrases.org.uk/meanings/376000.html

See also

★ Correlative-based fallacies

★ Descartes' Error

★ Law of the excluded middle, whose misapplication is sometimes the cause of this fallacy

★ Pascal's Wager

★ Nolan chart

★ Half-truths

References

1. ABC ''Counterpoint'' transcript (accessed 22 Oct 2006)
2. Ivor H. Evans, editor, ''Brewer's Dictionary of Phrase & Fable'', 14th edition, Harper & Row, 1989, ISBN 0-06-016200-7,
3. G.W. Bush. Address to a Joint Session of Congress and the American People
4. www.johnkerry.com
5. http://www.nader.org/interest/051905.html