The Personal Incredulity Fallacy is a logical fallacy which occurs when someone dismisses a claim simply because they find it difficult to understand or believe, rather than providing evidence or logical reasoning to support their disbelief. Because the individual finds the claim hard to fathom, they conclude — without further investigation — that it must be false. This type of fallacy is often used as a means of avoiding the need to engage with evidence or reasoning that supports the claim in question.
The fallacy relies on the flawed notion that if something seems too complex or unbelievable to an individual, then it must not be true. In reality, a person's inability to understand a concept says nothing about whether that concept is actually true or false. Many well-established scientific facts — from quantum mechanics to the scale of the universe — are deeply counterintuitive, yet supported by overwhelming evidence. Personal incredulity can sometimes be reinforced by confirmation bias, where a person is more inclined to reject claims that conflict with their existing worldview.
Personal incredulity often arises in situations where a person lacks the relevant background knowledge or expertise to evaluate a claim. Rather than seeking further information or deferring to qualified experts, the person substitutes their own sense of disbelief for an actual argument. It is frequently encountered in debates or discussions, where one party attempts to discredit the other party's claims by simply expressing amazement or disbelief rather than offering a substantive counter-argument.
The fallacy is a type of Informal Fallacy, and it is important to remember that just because something seems unbelievable does not mean that it is false. It is always important to investigate claims further and to evaluate the available evidence before drawing conclusions. Similarly, just because an individual finds a claim to be beyond their personal understanding does not mean that it should be dismissed without further investigation. Good critical thinking requires looking at the evidence on all sides of an argument before making any judgement.
