Skepticism Argument

A skepticism argument is a rhetorical and philosophical move in competitive debate that questions the epistemic foundations of an opponent's position rather than directly refuting its substance. Instead of arguing "you are wrong," the skeptic argues "you cannot know you are right" — or, in stronger forms, that no one can know anything about the contested topic at all.

Skepticism arguments appear across debate formats. In Lincoln-Douglas (LD) debate, "skep" is a recognized framework where the negative argues that moral knowledge is impossible, so the affirmative cannot meet its burden to prove the resolution true. In policy debate, skepticism often appears as a kritik of certainty, scientific consensus, or predictive claims (e.g., questioning whether impact scenarios can be reliably forecast). In parliamentary and Model UN settings, skeptical moves typically target the reliability of data, the neutrality of sources, or the feasibility of implementation.

Common variants include:

• Moral skepticism — denying that objective ethical truths exist or are knowable.
• Epistemic skepticism — denying that we can have justified belief about the claim.
• Empirical skepticism — challenging the data, methodology, or sourcing behind a factual claim.
• Predictive skepticism — denying that future consequences (impacts, scenarios) can be reasonably forecast.

Skepticism arguments are powerful because they exploit the burden of proof: if the proponent cannot establish their claim to a sufficient standard, the argument fails by default. However, they are often criticized as non-responsive or self-defeating — if nothing can be known, the skeptic's own argument cannot be known either (the tu quoque or self-refutation objection). Judges and chairs frequently weigh whether a skepticism argument engages the substance of the debate or merely stalls it.

In diplomatic practice, skepticism functions less as a formal argument and more as a negotiating posture — for example, states questioning the verifiability of arms-control commitments or the attribution of cyberattacks.