Refutation by Dilemma (Reducing to Exclusive Options)¶

Why It Matters¶

Many positions are vulnerable to this structure but people don't naturally see it. Constructing a dilemma reveals hidden inconsistencies and forces opponents to make explicit choices they'd prefer to leave vague.

The Key Move¶

Identify a proposition your opponent defends. Find two mutually exclusive interpretations, framings, or implications. Show that accepting either interpretation creates problems. Structure: "Your position commits you to either X or Y. If X, then [problem]. If Y, then [different problem]. Either way, your position fails."

Classic Application¶

Classical philosophical debates. "Is virtue teachable or innate? If teachable, why do good teachers have bad children? If innate, why do we punish wrongdoing?" Each horn creates difficulty for the claim that virtue is straightforward. Forces refinement or abandonment of the simple position.

Surprising Application¶

Security vulnerability disclosure debates. "Should we have coordinated disclosure or full disclosure? If coordinated, you're trusting vendors to fix vulnerabilities promptly (evidence shows they don't). If full, you're giving attackers exploit information before patches exist (enabling harm). The dilemma reveals why this is hard, not just a matter of choosing the 'right' policy."

Failure Modes¶

False dilemma - pretending two options are exhaustive when they're not. "Either we do X or disaster strikes" - there's usually a middle ground. Treating the dilemma as an endpoint rather than a move in dialogue - good opponents will find the third option you missed. Using dilemma when direct refutation would work better - this is a sophisticated tool, not always necessary.

Go Deeper¶

Cicero's "De Oratore" on arguing in utramque partem (on both sides). Rescher's "Dialectics" on aporetic structures.