◆ The Codex · 3 of 16
False dichotomy
Presenting two options as the only ones when more exist.
Also known as
False dilemmaEither-or fallacyBlack-and-white thinking
The shape of the move
Either X or Y. Not X. Therefore Y — when options Z, W, and more were never considered.
What is the false dichotomy fallacy?
A false dichotomy squeezes a range of possibilities into two, usually one reasonable-sounding and one terrible. Rejecting the terrible option then seems to force you into the other one.
Real decisions rarely come in pairs. There are usually middle positions, combinations, and entirely different approaches. The fallacy works by hiding them.
Examples
Politics
“You're either with us or against us.”
Why it fails: Neutrality, partial agreement, and conditional support all exist.
Everyday
“Either you take this job or you'll be unemployed forever.”
Why it fails: Other jobs, further study, and freelancing are ignored.
In a debate
“Either we ban phones in schools or students will never focus again.”
Why it fails: Phone lockers, lesson-time rules, and app limits are all middle options.
Why it feels convincing
Two options are cognitively easy, and framing a choice as "us or them" creates urgency. Under pressure, listeners pick a side instead of asking whether the menu is complete.
Spot it: Count the doors — reality almost always has more than two.
In the arena
If you’re about to commit it
- Before presenting two options, list at least one more — then explain why it fails.
- Replace "either… or" with "of the main options…".
- Argue that your option is BEST, not that it's the ONLY one.
Instead of
“Either we raise taxes or the hospitals close.”
Try
“Spending cuts and borrowing were both considered, but cuts would hit the same hospitals and borrowing costs 6% a year — so a targeted tax rise is the least damaging option.”
If your opponent commits it
- Name a third option out loud — just one breaks the frame.
- Ask why those are the only two choices.
- Shift the burden: they must rule out the alternatives.
Say this
“Those aren't the only two choices. What about Z? Until that's ruled out, the dilemma doesn't hold.”
When it’s not a fallacy
Some choices really are binary — a switch is on or off, a vote passes or fails. If the two options genuinely exhaust the possibilities, presenting them that way is accurate.
How the Oracle scores it
In an Arguen match, every argument is scored out of 80 across Clarity, Evidence, Logic and Rebuttal. If the Oracle detects a false dichotomy, it subtracts a penalty and puts the fallacy on your scorecard with the exact quote and a one-sentence explanation — so you see precisely where the chain snapped.
Frequently asked questions
Is a false dichotomy the same as a false dilemma?
Yes. They are two names for the same fallacy.
How do I spot one quickly?
Listen for "either… or", "the only alternative", or "if not this, then that" — then count whether more options exist.