MODR 1770B Note 6
Fallacy of Insufficient Presumption
- Fallacy of presumption falls under the sufficiency criterion.
- They occur in three types of cases:
o Where the facts were overlooked
o One evades the evidence
o One distorts the evidence
- He’s deleted strawman, red herring, amphiboly, and irrelevant thesis.
1. Conclusion: You shouldn’t oppose the proposal to amalgamate with the
Canadian Chiropractic College.
2. P1: The president and dean are strongly in favour of it
P2: You haven’t received tenure from them yet.
P3: Since you haven’t received tenure, opposing them wouldn’t be a good
3. Fallacy: Appeal to Emotion (fear)
4. Criterion of the fallacy: Seeking persuasion through fear
5. This happens in P2-3, when the person says that “Since they haven’t received
tenure yet, being against the idea that is supported by the dean and the
president (who can potentially kick them out).
1. You support promiscuity.
2. P1: You’ve never had a good relationship with a man
P2: You resort to recreational sex.
3. Abusive ad hominem
4. Attack on the person instead of the argument
5. It occurs in P1, where she claims that you think promiscuity is all right
because you’ve never had a good relationship with a man, so you would
resort to recreational sex.
6. This argument violates the relevancy criterion because it uses the fallacy
abusive ad hominem by attacking them with abusive terms, instead of using
valid reasoning to lead up to the conclusion.
- Taking a rule and you generalize it without taking any context into
- You have a small sample of evidence, and you extract a generalization out of
it. The Evidence might be relevant and acceptable, but it’s not enough.
- These are where most stereotypes stem from
Bifurcation - Good or bad.
- It takes two things that are contrary, and treat them as contradiction. False
- This is a fallacy because they do not take the middle considerations.
- Black and white, there is no gray: fallacious.
- Example: Jainism is allowed for contradiction because there’s 7 ways you can
capture the essence of what it is.
- Non-Aligned nation