The Argument from Incredulity: How People Explain What They Don't Understand

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The Argument from Incredulity: How People Explain What They Don't Understand
The argument from incredulity is a logical fallacy where someone assumes that if they can't believe that a certain concept is true, then it must be false, and vice versa. For example, if someone doesn't understand how evolution works, they might use the argument from incredulity in order to claim that the theory of evolution must be incorrect, since they are unable to see how it could possibly be true.


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The argument from incredulity

Is a logical fallacy where someone concludes that since they can’t believe that a certain concept is true, then it must be false and vice versa.

Its 2 basic forms:

I c...


Basic structure of an argument from incredulity

Premise 1: I can’t explain or imagine how proposition X can be true.

Premise 2: if a certain proposition is true, then I must be able to explain or imagine how that can be.


It’s ok to be incredulous

... and to bring this up as part of an argument. The issue with doing so occurs when this incredulity isn’t justified or supported by concrete information, and when this lack of belief is us...


Counter the argument from incredulity

  1. Explain why this sort of reasoning is fallacious: namely the fact that your opponent’s inability to explain a certain phenomenon or to understand a certain theory, does not invalid...



Cherry picking

It is a logical fallacy and it happens when we choose and focus only on evidence that supports our views and arguments while ignoring anything that may contradict us.

The problem with cherry picking

  • It fails to take into consideration all the available information
  • It presents information in a misleading way.
  • It might lead to improper analysis and might cause someone to paint a misleading picture of a certain outcome.

The principle of total evidence

Also referred to as Bernoulli’s maxim, it states that, when assessing the probability that a certain hypothesis is true, we must take into account all the available information.

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A fallacy is the use of faulty reasoning in an argument.

There are formal and informal fallacies:

  • A formal fallacy describes a flaw in the construction of a deductive ar...

Appeal to privacy

In this fallacy, someone behaves in a way that negatively affects others but then gets upset when others criticize their behavior. They will reply with a "mind your own business."
For instance, someone who doesn't see a reason to bathe, but then boards a full 10-hour flight.

Sunk cost fallacy

It happens when someone continues in a course of action, even if evidence shows that it's a mistake.

Common phrase: "We've always done it this way, so we'll keep doing it this way." "I've already invested so much..."

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Convince Them With Confidence

  • Speak confidently, be concise, and try not to repeat yourself. 
  • Give the appearance that you truly know what’s right from the beginning, even if you don’t have all o...

Avoid Common Argument Fallacies

Winning an argument often comes down to who can go the longest without contradicting themselves and keeping sound logic, not direct persuasion of the other party.

Anecdotal Fallacy

Using a single personal experience as the foundation of your argument or your big piece of evidence. 

For example, your phone may have broken right after you bought it, but you can’t use that to argue that those phones are not worth the purchase for others.

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