Logical Fallacies

Slippery Slope (definition)

A conclusion based on the premise that if A happens, then eventually through a series of small steps, through B,C....X,Y,Z will happen, too , basically equating A and Z. So, if we dont want Z to occur, A must not occur either

Slippery Slope (example)

If we ban Hummers because they are bad for the environment eventually the government will ban all cars, so we should not ban Hummers.

Hasty Generalization (definition)

A conclusion based on insufficient or biased evidence. In other words, you are rushing to a conclusion before you have all the relevant facts.

Hasty Generalization (example)

Even though its only the first day, I can tell this is going to be a boring course

Post hoc ergo propter hoc (definition)

This is a conclusion that asumes that if A occurred after B then B must have caused A

Post hoc ergo propter hoc (example)

I drank bottled water and now I am sick, so the water must have made me sick

Genetic Fallacy (definition)

A conclusion based on an argument that the origins of a person, idea, institute, or theory determine its character, nature, or worth.

Genetic Fallacy (example)

The Volkswagen Beetle is an evil car because it was originally designed by Hitler's army

Begging the Claim (definition)

The conclusion that the writer should prove is validated within the claim

Begging the Claim (example)

Filthy and polluting coal should be banned

Circular Argument (definition)

This restates the argument rather than actually proving it

Circular Argument (example)

George Bush is a good communicator because he speaks effectively

Either/or (definition)

A conclusion that oversimplifies the argument by reducing it to only two sides or choices

Either/or (example)

We can either stop using cars or destroy the earth

Ad Hominem (definition)

An attack on the character of a person rather that her/his opinions or arguments

Ad Hominem (example)

Green Peace's strategies aren't effective because they are all dirty, lazy hippies

Ad Populum (definition)

An emotional appeal that speaks to positive (such as patriotism, religion, democracy) or negative (such as terrorism or fascism) concepts rather than the real issue at hand

Ad Populum (example)

If you were a true American you would support the rights of people to choose whatever vehicle they want

Red Herring (definition)

A diversionary tactic that avoids the key issues, often by avoiding opposing arguments rather than addressing them

Red Herring (example)

The level of mercury in seafood may be unsage, but what will fishers do to support their families?

Straw Man (definition)

Oversimplifies an opponent's viewpoint and then attacks that hollow argument

Straw Man (example)

People who don't support the proposed state minimum wage increase hate the poor

Moral Equivalence (definition)

Compares two minor misdeeds with major atrocities

Moral Equivalence (example)

That parking attendant who gave me a ticket is a s bad as Hitler

Bandwagon Fallacy (definition)

Arguments that appeal to the growing popularity of an idea as a reason for accepting it as true. They take the mere fact that an idea suddenly attracting adherents as a reason for us to join in with the trend and become adherents of the idea ourselves

Bandwagon Fallacy (example)

Everyone should get the IPhone 5 because it is the most popular smart phone

Non Sequiturs (definition)

Occurs when a conclusion does not follow logically from what preceded it

Non Sequiturs (example)

The color red is the most popular car color in America; therefore, most car accidents involve red cars

Stacking the Deck (definition)

Any evidence that supports an opposing argument is simply rejected, omitted, or ignored

Stacking the Deck (example)

Global warming is not real because Antartica is still cold

Appeal to Authority (definition)

A writer seeks to persuade an audience not by giving evidence, but by appealing to the respect people have for the famous

Appeal to Authority (example)

These Shape-up shoes must work because Brooke Burke uses them

Complex Question (definition)

A question is asked (a) that rests on a questionable assumption, and (b) to which all answers appear to endorse that assumption

Complex Question (example)

Are you going to admit that you are wrong?

Sweeping Generalization (definition)

Applies a general statement too broadly (look for words like "never" or "always")

Sweeping Generalization (example)

Women always wear too much makeup