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11 errors in reasoning: avoid these if you want to look smarter

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Avoiding errors in reasoning, aka logical fallacies is crucial to forming better arguments and avoiding being manipulated by others

2000 years ago, Aristotle proposed that although we share much in common with the animal kingdom, what sets humans apart is our capacity for reason and rationality.

Unfortunately however, we all make errors in reasoning – either in our own minds, or when we are debating an issue with someone else.

When reason fails us we are committing what’s known as a logical fallacy (also known as a formal fallacy) -basically a defective or unsound argument.

Aristotle, who among many things was considered the father of formal logic, was the first to organize and define common logical fallacies based on the content of particular types of arguments.

Aristotle’s original list of 13 logical fallacies has expanded prodigiously over time and today whereby there are now some 300 formally recognized fallacies recognized.

Why are fallacies important?

It’s good to be able to identify the most common fallacies. Not only will it help you fine tune your own thought-making processes and critical thinking, it will also help you identify the ways in which people (especially politicians and the media) use fallacies to play tricks with your thoughts and bend the facts for their own purposes.

Here are a few of the benefits you will gain from knowing about logical fallacies:

  • Examine your own assumptions about the world and various issues
  • Question your subjective social perspectives (known as cognitive biases in psychology)
  • Become a more critical thinker
  • Avoid making errors yourself
  • Point out when someone else has made an obvious error in reasoning
  • Refute personal attacks
  • Identify attempts to skirt the boundaries of civil debate or gain the upper hand with an unsuspecting audience
  • You won’t be easy prey for propagandists and marketers
  • Become more persuasive
  • Use evidence in an appropriate manner

11 of the most common errors in reasoning

So here’s a list of 11 common fallacies, which along with their names in Latin and examples, will help you make better arguments, and identify weak ones.

No True Scotsman Fallacy

Also known as: No true Christian

A claim that a person can’t be part of a certain group unless they have particular characteristics – an attempt to omit relevant counter examples which might disprove an argument by continually moving the goalposts.


Person 1: “All Scotsmen eat haggis.”

Person 2: “MacDonald doesn’t like haggis.”

Person 1: “Well, MacDonald isn’t a real Scotsman.”

Attacking the person

Also known as: sophism, poisoning the well

Latin name: Argumentum Ad Hominem

The personal attack fallacy has to do with smearing the character of a person making a claim, rather than addressing the actual issue being debated. Personal attacks are irrelevant because flinging insults has no bearing on the truth of a person’s argument.


Person 1: “Britain should leave the European Union because it undermines national sovereignty.”

Person 2: “You are xenophobic and intolerant.”

Does Not Follow

Also Known as: Irrelevant reason

Latin name: Non sequitur

A non sequitur occurs when an argument’s conclusion does not follow from its premises, or the conclusion is irrelevant. Usually there is a missing step or two required to reach the desired conclusion.


Biotech companies are spraying pesticides on crops in this area. The state government is spraying too. It must be safe for biotech companies to spray.

Appeal to Tradition

Also known as: Appeal to antiquity

Latin name: Argumentum Ad Antiquitatem

Arguing that just because something is traditional or has been done a certain way for a long time, that it must be valid.


Parents have been spanking children for thousands of years, so spanking is not harmful.

Appeal to Popularity

Also known as: Bandwagon or peer pressure

Latin name: Argumentum ad Populum

A favorite device of marketers and propagandists, this fallacy is an overture to what is popular and is really more about inspiring enthusiasm rather than constructing a good argument, since most people are concerned about what the majority thinks.


Almost everybody uses social media. Social media use is good for society.

Red Herring

Also known as: Strawman argument, missing the point

Latin name: Ignorantio Elenchi

Occurs when one person tries to misrepresent their opponent’s argument by failing to address the issue in question.


Person 1: “I believe in the right to self defense.”

Person 2: “You think everyone should be forced to own a gun.”

Begging The Question

Also known as: Circular reasoning

Latin name: Petitio Principi

Begging the question happens when someone assumes as true what they are trying to prove, which often happens with deeply ingrained beliefs.


Ahura Mazda is all knowing and infallible. We know this because the Zoroastrian scriptures tell us so. Therefore, Ahura Mazda is all knowing and infallible.

Slippery Slope

Also known as: Absurd extrapolation

A form of non sequiter that occurs when someone asserts that once X happens, Y will inevitably follow from X, which usually involves extremes and exaggeration. (Not every slippery slope argument is fallacious, only when there are insufficient reasons to believe that something is inevitable.)


Marijuana is a gateway drug. Once someone uses it, it’s only a matter of time until they try other drugs like heroin. Therefore, marijuana should be illegal.

False Dichotomy

Also known as: False dilemma, excluded middle, the black and white fallacy.

This error in reasoning occurs when someone assumes there must only be two choices or outcomes – usually there are several possibilities that they just haven’t thought of yet.


Hillary Clinton is a crooked and corrupt politician, therefore you should vote for Trump.

Cherry Picking

Also known as: Hasty Generalization

Latin name: Dicto Simpliciter

Assuming something must be generally true based on too small of a sample size or failing to look at the bigger picture.


I have met racist white people, therefore all whites are racist.

Appeal to Authority

Also known as: Appeal to experts

Latin name: Argumentum Ad Verecudinum

Arguing that just because an expert thinks something that it must be true, or that an expert can’t be biased or make errors.

Paul Offit says its safe for kids to have 10,000 vaccines all at once. He is a doctor. Therefore, it must be safe for kids to have 10,000 vaccines at one.