LogicalMANIPULATIVE

Appeal to Consequences

What it is

Arguing that something must be true (or false) because the consequences of it being true would be desirable (or undesirable).

How it works

This fallacy substitutes wishful thinking for evidence. "This can't be true because if it were, it would be terrible" is emotionally compelling but logically empty. The desirability of a conclusion has no bearing on its truth. This is especially powerful when the stakes are high and the truth is genuinely frightening.

Real-world examples

  • •"Climate change can't be real because dealing with it would be too expensive."
  • •"If evolution is true, life has no purpose — so it must be false."
  • •"This treatment must work because the alternative is too horrible to contemplate."

Ethical guidelines

  • ●Truth is independent of our preferences about what is true.
  • ●Avoiding uncomfortable truths prevents appropriate responses to real problems.
  • ●Honest reasoning requires accepting conclusions supported by evidence regardless of their desirability.

How to defend against it

  • ►Separate the question "Is this true?" from "Do I want this to be true?"
  • ►Notice when emotional stakes are driving your evaluation of evidence.
  • ►Accept that some truths are unpleasant — that's a feature of reality, not a flaw in the evidence.

From the Defense Playbook

"Which Step, Specifically?"minutes

When told that one action will lead through a chain of events to a dramatic outcome, lay the chain out link by link, ask what makes each link likely, and remember that the probability of the whole chain is lower than that of its weakest link.

Every playbook entry states how strong its evidence is and when not to use it. Browse the full playbook.

References

  1. Kunda, Z. (1990). The case for motivated reasoning. Psychological Bulletin, 108(3), 480–498
    Review showing that the desirability of a conclusion biases how evidence is gathered and weighed — the psychological engine behind the entry's claim that the argument 'substitutes wishful thinking for evidence'.
  2. Walton, D. (1999). Historical origins of argumentum ad consequentiam. Argumentation, 13(3), 251–264
    Traces the fallacy label and analyses when arguing from the consequences of a proposition to its truth or falsity is fallacious — the entry's definition.
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