Logical

Appeal to Ignorance

What it is

Claiming that something is true because it hasn't been proven false, or false because it hasn't been proven true.

How it works

Absence of evidence is treated as evidence of absence (or presence). This exploits the difficulty of proving negatives — it's nearly impossible to prove something doesn't exist. The fallacy shifts the burden of proof away from the person making the claim to the person questioning it.

Real-world examples

  • •"No one has proven that this supplement doesn't work, so it must be effective."
  • •"We haven't found evidence of fraud, therefore the system is secure."
  • •"You can't prove he didn't do it, so he probably did."

Ethical guidelines

  • ●The burden of proof lies with the person making a positive claim.
  • ●Absence of evidence should be acknowledged as uncertainty, not claimed as proof.
  • ●Honest discourse distinguishes between "unproven" and "disproven."

How to defend against it

  • ►Always ask: "Who has the burden of proof here?" — it's the person making the claim.
  • ►Distinguish between "no evidence for" and "evidence against" — they are different.
  • ►Demand positive evidence rather than accepting absence of disproof.

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