Philosophy EthicsAre These Reasons Actually Good Evidence?
Sage the owl lifts a glowing slip of paper labeled 'reason' on one side of a brass balance scale and watches the other side—labeled 'conclusion'—rise or fall as new slips are added.
- Define an argument as reasons (premises) offered to support a conclusion.
- Identify whether a reason is true and whether it actually connects to the conclusion.
- Recognize that popularity is not evidence, and explain why the bandwagon fallacy fails.
- Apply a two-question test to judge whether any argument deserves agreement.
Key terms
- argument
- a set of reasons offered to support a conclusion someone wants you to accept
- conclusion
- the main point an argument is trying to get you to accept
- premise
- a supporting statement, also called a reason, offered to back up the conclusion
- bandwagon fallacy
- treating widespread agreement as proof that a claim is true
Two Questions, in Order
A good argument has to pass two separate tests, and the order matters. First, is the reason true? A reason that is false cannot support anything, like a stone painted gold that fools you only briefly. Second, even if the reason is true, does it genuinely connect to the conclusion? A true but unrelated reason is like a feather on the scale, adding no real weight. Both answers must be yes. Many weak arguments slip through because people check only one of these and stop.
Popularity Is Not Weight
The bandwagon fallacy fails both tests at once: 'everyone agrees, so it must be true.' Truth does not work by voting. Whether a claim is correct depends on evidence and logic, not on the headcount of believers. History is full of ideas that almost everyone accepted and that later proved false, which shows the number of believers adds nothing to the scale. When you feel pulled to agree because something sounds popular or is stated with great confidence, that is exactly the moment to slow down and run the two-question test.
Worked examples
Judge this argument: 'The pool closes at eight, so we cannot swim at nine.'
- Identify the conclusion: 'we cannot swim at nine.'
- Identify the reason: 'the pool closes at eight.'
- Ask question one: is the reason true — does the pool actually close at eight?
- Ask question two: if true, does closing at eight genuinely support being unable to swim at nine?
Answer: If the pool truly closes at eight, the reason is both true and clearly connected, so the argument passes both tests and deserves agreement; the conclusion follows that you cannot swim at nine.
Activity
Sort each card into the correct bin: Is this a Reason, a Conclusion, or a Fallacy?
Practice
Run the two-question test on 'It rained last night, so the team will lose today.'
Explain why 'everyone believes it' adds no weight to an argument's reasons.
Common mistakes to avoid
- Many people agreeing makes it trueTruth depends on evidence and logic, not on a headcount; popularity adds no weight to the reasons.
- A confident or expert speaker means the reason is trueConfidence and credentials are cues, not evidence; the reason must still be true and genuinely connected.
Check your understanding
In an argument, what is a reason (premise)?
Mia says: 'That idea must be wrong because not many people support it.' What is the problem with her argument?
To decide whether an argument is good, which two questions must BOTH be answered 'yes'?
Recap
An argument offers reasons, called premises, to support a conclusion. A good one passes two tests in order: the reason must be true, and it must genuinely connect to the conclusion. Popularity and confidence are not evidence and add no weight.
Reflect
When did a confident-sounding argument turn out to rest on a weak reason?