Argument from Incredulity — "That Can't Be True!"

Hook

"Okay but EVOLUTION? You're telling me that over millions of years, random mutations and natural selection produced every species on Earth including humans? That just... doesn't make sense to me. It's too complicated. It CAN'T be true."

And yet: it is.

"Billions of stars? Like, BILLIONS? That's literally impossible to comprehend. The universe can't be that big."

And yet: it is. (It's actually even bigger than that. Sorry.)

"Wait, quantum particles can be in two places at once? That makes zero sense. Physics doesn't work like that."

And yet: it does. Quantum physics is wild.

Here's the thing your brain needs to understand: the universe does not care what you find believable.

What's Actually Going On?

The Argument from Incredulity (also called "Appeal to Incredulity") is when someone rejects a claim simply because they can't imagine it being true — not because there's evidence against it.

The logic goes: "I can't understand/believe/picture this → Therefore it must be false."

The problem? Your ability to comprehend something has nothing to do with whether it's real.

Most of reality is deeply weird. Atoms are mostly empty space. Time slows down near massive objects. The further away a galaxy is, the faster it's moving away from us. Your own DNA contains instructions for building a human being from a single cell.

None of this is intuitive. None of it fits neatly into everyday human experience. And all of it is true.

If "I can't picture it" were a valid argument against things being real, we'd have to throw out basically all of modern physics, chemistry, and biology. The universe was not designed to be easily imaginable by a 15-year-old human brain. (No offense. Adult brains also struggle. Einstein was confused by quantum mechanics his whole life.)

Real Life — You've Seen This

Climate change denialism: "The climate has always changed. That humans could affect the entire global climate just by burning fuel — that seems impossible. We're too small." Scale doesn't determine truth. Small particles of lead can poison an entire water supply.

Anti-evolution arguments: "An eye is so complex. It couldn't have evolved step by step — I just can't see how that would work. So it must have been designed." "I can't see how" is not evidence of design. It's evidence that evolutionary biology is a complex field worth studying.

Conspiracy thinking: "You're telling me something this big could be kept secret by thousands of people? That's impossible. Someone would've talked." (Note: people DO talk, which is why most real conspiracies get exposed. Large successful conspiracies are actually quite rare for this exact reason — but it's not impossible.)

In your own life: "She got a 98 on that exam without studying? That can't be true. She must have cheated." Or maybe she actually studies more than you think, has a talent for the subject, or prepared differently. "Can't believe it" isn't the same as "it didn't happen."

How to Spot It

Ask: "Is this based on evidence, or on someone's inability to picture it?"

Signs of Argument from Incredulity:

• "I just can't see how..." / "That makes no sense to me" as a conclusion, not a question. Confusion is a great starting point for learning. It's a terrible ending point for arguments.

• Personal comprehension used as evidence. "I don't understand it" ≠ "It's wrong."

• Complexity used as a dealbreaker. "It's too complicated to have happened naturally." Complicated things happen in nature constantly. That's kind of nature's whole thing.

• The feeling of impossibility without checking the math/evidence. "Billions of years? That's too long." It's not too long for the actual universe. It's only too long for human intuition.

The Difference Between Doubt and Incredulity

Healthy skepticism sounds like: "That's surprising — what's the evidence? Can I look at it?"

Argument from Incredulity sounds like: "That can't be right, I don't buy it, end of discussion."

One opens a door. The other slams it.

Doubt is the beginning of good thinking. Incredulity is the end of it.

When something seems impossible to you, that's actually exciting — it means you might be about to learn something that genuinely expands how you see the world. Quantum mechanics is hard to picture, and once you start understanding it, it's one of the most mind-blowing things humans have ever discovered.

"That's impossible" can mean: "I should learn more about this."

It should never mean: "Therefore I'm done thinking about it."

🎯 Challenge

Think of something you once thought was impossible — and turned out to be true. (Big or small. It could be something in science, history, or just something someone told you that you didn't believe at first.)

Then ask yourself:

• Why did it seem impossible?
• What made you change your mind (if you did)?
• Is there something you currently believe is impossible — that you've never actually checked the evidence for?

Write it down. If you want to level up: pick one "impossible-seeming" thing from science (black holes, deep time, quantum entanglement, the scale of the universe) and actually read a 5-minute explanation of how it works.

Your brain might stretch a bit. That's normal. That's growth.