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Week3 Part1 LA17601b

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Fallacies: 9-14

9. & 10. Hasty Generalization & Accident

‘Hasty generalization’ is also called ‘converse accident.’


• Don’t go down to River Road. I was down there
once and got mugged. They’re all thieves down
there.
• I am sure their President will be reasonable
about the matter. After all, man is a rational
animal.
11. Slippery Slope
• We should oppose any effort by government to censor
obscene books, movies, or other forms of expression, no
matter how offensive we may find such material. The reason
is that once government has the power to ban obscenity,
that precedent will open the door to further controls on
speech: banning racist remarks, then speech that the
majority finds offensive, then speech that opposes
government policies, and so on until no one is free to say
anything without government permission.
12. Complex Question
• A complex question involves asking a question in such
a way as to presuppose the truth of some conclusion
buried in that question.
• When a question is complex, and all of its
presuppositions are to be denied, they must be
denied individually.
• Why is the private development of resources so much
more efficient than any government-owned
enterprise?
Lawyer: The figures seem to indicate that your sales
increased as a result of these misleading
advertisements. Is that correct?
Witness: They did not!
Lawyer: But you do admit, then, that your
advertisement was misleading. How long have you
been engaging in practices like these?
13. Begging the Question: Petitio Principii
• To beg the question is to assume the truth of what
one seeks to prove, in the effort to prove it. The
premise(s) and the conclusion tend to be identical in
such cases. Such arguments are also called circular
arguments.
•All of us cannot be famous, because all of
cannot be well known.
--Jesse Jackson, 1984
• To allow every man unbounded freedom of
speech must always be, on the whole,
advantageous to the state; for it is highly
conducive to the interests of the community that
each individual should enjoy a liberty, perfectly
unlimited, of expressing his sentiments.
• To allow every man unbounded freedom of speech
must always be, on the whole, advantageous to the
state; for it is highly conducive to the interests of the
community that each individual should enjoy a liberty,
perfectly unlimited, of expressing his sentiments.
• “advantageous to the state” = “highly conducive to
the interests of the community”
• “allow every man unbounded freedom of speech” =
“each individual should enjoy a liberty, perfectly
unlimited, of expressing his sentiments”
14. Irrelevant Conclusion: Ignoratio Elenchi
• The fallacy of ignoratio elenchi is committed when an
argument purporting to establish a particular
conclusion is instead directed to proving a different
conclusion. Also called a diversion or a non sequitur
(meaning: ‘it does not follow’). Most fallacies can be
grouped under this fallacy to some extent, but the
term is used when none of the other fallacies have
been committed.
• An attorney is always free to consult law books.
And a physician often looks up cases in medical
texts. Everyone should be allowed a similar
freedom of reference. So students should be
permitted to use their textbooks during
examinations.
15 & 16: Composition and Division
• I’m sure this outfit will look great. It’s got
leopard print, zebra print, plaid, and polka dots,
and I like each of those patterns.
• This car is made by Honda. So every part of this
car is made by Honda.

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