A logical fallacy is a flaw in reasoning. Strong arguments are void of logical fallacies, whilst arguments that are weak tend to use logical fallacies to appear stronger than they are. They’re like tricks or illusions of thought, and they’re often very sneakily used by politicians, the media, and others to fool people.

Don’t be fooled!

Misrepresenting someone’s argument to

make it easier to attack.

By exaggerating, misrepresenting, or just completely fabricating someone’s argument, it’s easier to present your own position as being reasonable, but this kind of dishonesty serves to undermine honest rational debate.

After Will said that we should put more money into

health and education, Warren responded by saying that

he was surprised that Will hates our country so much

that he wants to leave it defenseless by cutting

military spending.

Cherry-picking data clusters to suit an

argument, or finding a pattern to fit a

presumption.

This ‘false cause’ fallacy is coined after a marksman shooting randomly at barns and then painting bullseye targets around the spot where the most bullet holes appear, making it appear as if he’s a really good shot. Clusters naturally appear by chance, but don’t necessarily show that there is a causal relationship.

The makers of Sugarette Candy Drinks point to

research showing that of the five countries where

Sugarette drinks sell the most units, three of them are in

the top ten healthiest countries on Earth, therefore

Sugarette drinks are healthy.

Attacking your opponent’s character

or personal traits in an attempt to

undermine their argument.

Ad hominem attacks can take the form of overtly attacking somebody, or more subtly casting doubt on their character or personal attributes as a way to discredit their argument. The result of an ad hom attack can be to undermine someone’s case without actually having to engage with it.

After Sally presents an eloquent and compelling case

for a more equitable taxation system, Sam asks the

audience whether we should believe anything from a

woman who isn’t married, was once arrested, and

smells a bit weird.

Asking a question that has an

assumption built into it so that it can’t be

answered without appearing guilty.

Loaded question fallacies are particularly effective at derailing rational debates because of their inflammatory nature – the recipient of the loaded question is compelled to defend themselves and may appear flustered or on the back foot.

Grace and Helen were both romantically interested in

Brad. One day, with Brad sitting within earshot, Grace

asked in an inquisitive tone whether Helen was having

any problems with a fungal infection.

Believing that ‘runs’ occur to statistically

independent phenomena such as roulette

wheel spins.

This commonly believed fallacy can be said to have helped create an entire city in the desert of Nevada USA. Though the overall odds of a ‘big run’ happening may be low, each spin of the wheel is itself entirely independent from the last. So whilst there may be a very small chance that heads will come up 20 times in a row if you flip a coin, the chances of heads coming up on each individual flip remain 50/50, and aren’t influenced by what happened before.

Red had come up six times in a row on the roulette

wheel, so Greg knew that it was close to certain that

black would be next up.  Suffering an economic form of

natural selection with this thinking, he soon lost all of

his savings.

Appealing to popularity or the fact that

many people do something as an

attempted form of validation.

The flaw in this argument is that the popularity of an idea has absolutely no bearing on its validity.  If it did, then the Earth would have made itself flat for most of history to accommodate this popular belief.

Shamus pointed a drunken finger at Sean and asked

him to explain how so many people could believe in

leprechauns if they’re only a silly old superstition.

Sean, however, had had a few too many Guinness

himself and fell off of his chair.

Where two alternative states are

presented as the only possibilities, when

in fact more possibilities exist.

Also known as the false dilemma, this insidious tactic has the appearance of forming a logical argument, but under closer scrutiny it becomes evident that there are more possibilities than the either/or choice that is presented. Binary, black-or-white thinking doesn’t allow for the many different variables, conditions, and contexts in which there would exist more than just the two possibilities put forth. It frames the argument misleadingly and obscures rational, honest debate.

Whilst rallying support for his plan to fundamentally

undermine citizens’ rights, the Supreme Leader told

the people they were either on his side, or on the side

of the enemy.

A circular argument in which the

conclusion is included in the premise.

This logically incoherent argument often arises in situations where people have an assumption that is very ingrained, and therefore taken in their minds as a given. Circular reasoning is bad mostly because it’s not very good.

The word of Zorbo the Great is flawless and perfect. We

know this because it says so in The Great and Infallible

Book of Zorbo’s Best and Most Truest Things that are

Definitely True and Should Not Ever Be Questioned.

Using the opinion or position of an

authority figure, or institution of

authority, in place of an actual argument.

It’s important to note that this fallacy should not be used to dismiss the claims of experts, or scientific consensus. Appeals to authority are not valid arguments, but nor is it reasonable to disregard the claims of experts who have a demonstrated depth of knowledge unless one has a similar level of understanding and/or access to empirical evidence. However it is, entirely possible that the opinion of a person or institution of authority is wrong; therefore the authority that such a person or institution holds does not have any intrinsic bearing upon whether their claims are true or not.

Not able to defend his position that evolution ‘isn’t true’

Bob says that he knows a scientist who also questions

evolution (and presumably isn’t a primate).

Making the argument that because

something is ‘natural’ it is therefore valid,

justified, inevitable, good, or ideal.

Many ‘natural’ things are also considered ‘good’, and this can bias our thinking; but naturalness itself doesn’t make something good or bad. For instance murder could be seen as very natural, but that doesn’t mean it’s good or justifiable.

The medicine man rolled into town on his bandwagon

offering various natural remedies, such as very special

plain water. He said that it was only natural that

people should be wary of ‘artificial’ medicines such

as antibiotics.

Assuming that what’s true about one part

of something has to be applied to all, or

other, parts of it.

Often when something is true for the part it does also apply to the whole, or vice versa, but the crucial difference is whether there exists good evidence to show that this is the case. Because we observe consistencies in things, our thinking can become biased so that we presume consistency to exist where it does not.

Daniel was a precocious child and had a liking for logic.

He reasoned that atoms are invisible, and that he was

made of atoms and therefore invisible too.

Unfortunately, despite his thinky skills, he lost the game

of hide and go seek.

Using personal experience or an isolated

example instead of a valid argument,

especially to dismiss statistics.

It’s often much easier for people to believe someone’s testimony as opposed to understanding complex data and variation across a continuum. Quantitative scientific measures are almost always more accurate than personal perceptions and experiences, but our inclination is to believe that which is tangible to us, and/or the word of someone we trust over a more ‘abstract’ statistical reality.

Jason said that that was all cool and everything, but his

grandfather smoked, like, 30 cigarettes a day and lived

until 97 – so don’t believe everything you read about

meta analyses of sound studies showing proven

causal relationships.

Making what could be called an appeal to

purity as a way to dismiss relevant

criticisms or flaws of an argument.

In this form of faulty reasoning one’s belief is rendered unfalsifiable because no matter how compelling the evidence is, one simply shifts the goalposts so that it wouldn’t apply to a supposedly ‘true’ example. This kind of post-rationalization is a way of avoiding valid criticisms of one’s argument.

Angus declares that Scotsmen do not put sugar on

their porridge, to which Lachlan points out that he is a

Scotsman and puts sugar on his porridge. Furious, like a

true Scot, Angus yells that no

true Scotsman sugars his porridge.

Holly said that vaccinations caused autism in children,

but her scientifically well-read friend Caleb said that this

claim had been debunked and proven false. Their friend

Alice ooffered a compromise that vaccinations cause

some autism.

Judging something good or bad on the

basis of where it comes from, or from

whom it comes.

This fallacy avoids the argument by shifting focus onto something’s or someone’s origins. It’s similar to an ad hominem fallacy in that it leverages existing negative perceptions to make someone’s argument look bad, without actually presenting a case for why the argument itself lacks merit.

Accused on the 6 o’clock news of corruption and taking

bribes, the senator said that we should all be very wary

of the things we hear in the media, because we all

know how very unreliable the media can be.

Using double meanings or ambiguities of

language to mislead or misrepresent the

truth.

Politicians are often guilty of using ambiguity to mislead and will later point to how they were technically not outright lying if they come under scrutiny. The reason that it qualifies as a fallacy is that it is intrinsically misleading.

When the judge asked the defendant why he hadn’t

paid his parking fines, he said that he shouldn’t have to

pay them because the sign said ‘Fine for parking here’

and so he naturally presumed that it would be fine to

park there.

Presuming that a real or perceived

relationship between things means that

one is the cause of the other.

Many people confuse correlation (things happening together or in sequence) for causation (that one thing actually causes the other to happen). Sometimes correlation is coincidental, or it may be attributable to a common cause.

Pointing to a fancy chart, Roger shows how

temperatures have been rising over the past few

centuries, whilst at the same time the numbers of

pirates have been decreasing; thus pirates cool the

world and global warming is a hoax.

Presuming that because a claim has been

poorly argued, or a fallacy has been made,

that it is necessarily wrong.

It is entirely possible to make a claim that is false yet argue with logical coherency for that claim, just as is possible to make a claim that is true and justify it with various fallacies and poor arguments.

Recognizing that Amanda had committed a fallacy in

arguing that we should eat healthy food because a

nutritionist said it was popular, Alyse said we should

therefore eat bacon double cheeseburgers every day.

Manipulating an emotional response in

place of a valid or compelling argument.

Appeals to emotion include appeals to fear, envy, hatred, pity, pride, and more. It’s important to note that sometimes a logically coherent argument may inspire emotion or have an emotional aspect, but the problem and fallacy occurs when emotion is used instead of a logical argument, or to obscure the fact that no compelling rational reason exists for one’s position. Everyone, bar sociopaths, is affected by emotion, and so appeals to emotion are a very common and effective argument tactic, but they’re ultimately flawed, dishonest, and tend to make one’s opponents justifiably emotional.

Luke didn’t want to eat his sheep’s brains with chopped

liver and brussel sprouts, but his father told him to

think about the poor, starving children in a third world

country who weren’t fortunate enough to have any

food at all.

Avoiding having to engage with criticism

by turning it back on the accuser –

answering criticism with criticism.

Pronounced too-kwo-kwee. Literally translating as ‘you too’ this fallacy is also known as the appeal to hypocrisy. It is commonly employed as an effective red herring because it takes the heat off someone having to defend their argument, and instead shifts the focus back on to the person making the criticism.

The blue candidate accused the red candidate of

committing the tu quoque fallacy. The red candidate

responded by accusing the blue candidate of the same,

after which ensued an hour of back and forth criticism

with not much progress.

Saying that the burden of proof lies not

with the person making the claim, but

with someone else to disprove.

The burden of proof lies with someone who is making a claim, and is not upon anyone else to disprove. The inability, or disinclination, to disprove a claim does not render that claim valid, nor give it any credence whatsoever. However it is important to note that we can never be certain of anything, and so we must assign value to any claim based on the available evidence, and to dismiss something on the basis that it hasn’t been proven beyond all doubt is also fallacious reasoning.

Bertrand declares that a teapot is, at this very moment,

in orbit around the Sun between the Earth and Mars,

and that because no one can prove him wrong his

claim is therefore a valid one.

Saying that because one finds something

diffcult to understand that it’s therefore

not true.

Complex subjects like biological evolution through natural selection require some amount of understanding before one is able to make an informed judgement about the subject at hand; this fallacy is usually used in place of that understanding.

Kirk drew a picture of a fish and a human and with

effusive disdain asked Richard if he really thought we

were stupid enough to believe that a fish somehow

turned into a human through just, like, random things

happening over time.

Moving the goalposts to create exceptions

when a claim is shown to be false.

Humans are funny creatures and have a foolish aversion to being wrong. Rather than appreciate the benefits of being able to change one’s mind through better understanding, many will invent ways to cling to old beliefs. One of the most common ways that people do this is to post-rationalize a reason why what they thought to be true must remain to be true. It’s usually very easy to find a reason to believe something that suits us, and it requires integrity and genuine honesty with oneself to examine one’s own beliefs and motivations without falling into the trap of justifying our existing ways of seeing ourselves and the world around us.

Edward Johns claimed to be psychic, but when his

‘abilities’ were tested under proper scientific conditions,

they magically disappeared. Edward explained this

saying that one had to have faith in his abilities for

them to work.

Asserting that if we allow A to happen,

then Z will consequently happen too,

therefore A should not happen.

The problem with this reasoning is that it avoids engaging with the issue at hand, and instead shifts attention to extreme hypothetical’s.  Because no proof is presented to show that such extreme hypothetical’s will in fact occur, this fallacy has the form of an appeal to emotion fallacy by leveraging fear. In effect the argument at hand is unfairly tainted by unsubstantiated conjecture.

Colin Closet asserts that if we allow same-sex couples

to marry, then the next thing we know we’ll be

allowing people to marry their parents, their cars and even monkeys