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Slippery Slope Arguments: Understanding the Fallacy and Its Examples, Study notes of Theatre

An overview of slippery slope arguments (SSAs), their structure, and how they are used to reject policy reforms. It explains that SSAs are fallacious when there are no good reasons provided for the chain of steps leading to the disastrous result, and provides examples of both fallacious and legitimate SSAs. It also introduces the concept of the ski lift argument, which is the reverse of the slippery slope argument.

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CRITICAL THINKING HANDOUT 12 SLIPPERY SLOPE ARGUMENTS
1. What is a Slippery-Slope Argument (SSA)?
A slippery-slope argument (also known as a wedge argument) is an argument that contends
that an action should not be performed because if the action were performed, it would lead (by a
series of steps) to a negative, disastrous, or undesirable result.
S
TRUCTURE OF A
S
LIPPERY
-S
LOPE
A
RGUMENT
1 (premise)
If A, then B.
2 (premise)
If B, then C.
3 (premise)
If C, then D (Disaster!)
4 (conclusion)
Avoid D (Disaster), don’t allow A.
Slippery-slope arguments (SSAs) are commonly used to reject policy reforms as they contend
that a seemingly innocuous change in policy will lead, in a step-by-step fashion, to disastrous
consequences.
EXAMPLE #1 OF A SLIPPERY SLOPE ARGUMENT
P1
If you legalize marriage for same-sex couples, then men can legally marry men and women
can legally marry women.
P2
If men can legally marry men and women can marry women, then soon people will be able
to legally marry animals. .
P3
If people are legally able to marry animals, then, not too long later, people will be able to
legally marry inanimate objects.
P4
But, people should not be allowed to legally marry inanimate objects. Just imagine if you
die and are married to a pet rock. Who will inherit your life savings? Not people, but a pet
rock. Ridiculous!
C
Since we don’t want to let pet rocks get inheritances, we should not allow the legalization
of same-sex marriages.
In addition to persuading individuals, SSAs can be used for humorous effect:
E
XAMPLE
#2
OF A
S
LIPPERY
S
LOPE
A
RGUMENT
:
F
ROM A
D
IREC
TV
C
OMMERCIAL
1
When your cable company puts you on hold, you get angry.
2
When you get angry, you go blow-off steam.
3
When you go blow-off steam, accidents happen.
4
When accidents happen, you get an eye-patch.
5
When you get an eye-patch, people think you’re tough.
6
When people think you’re tough, people want to see how tough.
7
And when people want to see how tough, you wake-up in a roadside ditch.
8
Don’t wake-up in a roadside ditch. Get rid of cable and upgrade to DirecTV
2. When is a Slippery-Slope Legitimate and when is it Fallacious?
Some SSAs are legitimate while others are illegitimate (fallacious). A SSA is fallacious
(commits the slippery slope fallacy) when the following condition is met:
pf3
pf4
pf5

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CRITICAL T HINKING – H ANDOUT 12 – SLIPPERY SLOPE ARGUMENTS

1. What is a Slippery-Slope Argument (SSA)?

A slippery-slope argument (also known as a wedge argument ) is an argument that contends

that an action should not be performed because if the action were performed, it would lead (by a

series of steps) to a negative, disastrous, or undesirable result.

S TRUCTURE OF A S LIPPERY-S LOPE ARGUMENT

1 (premise) If A, then B. 2 (premise) If B, then C. 3 (premise) If C, then D ( Disaster !) 4 (conclusion) Avoid D ( Disaster) , don’t allow A.

Slippery-slope arguments (SSAs) are commonly used to reject policy reforms as they contend

that a seemingly innocuous change in policy will lead, in a step-by-step fashion, to disastrous

consequences.

E XAMPLE #1 OF A S LIPPERY S LOPE ARGUMENT

P1 If you legalize marriage for same-sex couples, then men can legally marry men and women can legally marry women. P2 If men can legally marry men and women can marry women, then soon people will be able to legally marry animals.. P3 If people are legally able to marry animals, then, not too long later, people will be able to legally marry inanimate objects. P4 But, people should not be allowed to legally marry inanimate objects. Just imagine if you die and are married to a pet rock. Who will inherit your life savings? Not people, but a pet rock. Ridiculous! C Since we don’t want to let pet rocks get inheritances, we should not allow the legalization of same-sex marriages.

In addition to persuading individuals, SSAs can be used for humorous effect:

E XAMPLE #2 OF A S LIPPERY S LOPE ARGUMENT : F ROM A DIRECTV COMMERCIAL

1 When your cable company puts you on hold, you get angry. 2 When you get angry, you go blow-off steam. 3 When you go blow-off steam, accidents happen. 4 When accidents happen, you get an eye-patch. 5 When you get an eye-patch, people think you’re tough. 6 When people think you’re tough, people want to see how tough. 7 And when people want to see how tough, you wake-up in a roadside ditch. 8 Don’t wake-up in a roadside ditch. Get rid of cable and upgrade to DirecTV

2. When is a Slippery-Slope Legitimate and when is it Fallacious?

Some SSAs are legitimate while others are illegitimate (fallacious). A SSA is fallacious

(commits the slippery slope fallacy) when the following condition is met:

Reasons are not provided in the passage from A to D either because good reasons do not

exist OR the possible reasons that do exist are controversial.

In other words, the slippery slope fallacy simply describes the chain of steps that lead to the

disastrous result—e.g. first this will happen, then this, and then this, and then disaster —but (i)

fails to explain why one step leads to another and (ii) the chain of steps is controversial.

SSAs are fallacious because they wrongly assume that there are good reasons for the steps for A

to D but it is not necessary to state them since they are uncontroversial.

E XAMPLE #3 OF F ALLACIOUS S LIPPERY-S LOPE ARGUMENT

P1 If you legalize weed, tons of people will smoke it every day. P2 If people smoke weed every day, they will ultimately want to experiment with new, harder drugs. P3 When people want to experiment with new, harder drugs, they neglect their children. C Don’t let people neglect their children. Keep marijuana illegal.

The above SSA is fallacious because:

(i) no reason is given for why the legalization of marijuana will lead to rampant

marijuana smoking AND the types of reasons that presently could be given for the

legalization of marijuana will lead to rampant marijuana smoking are controversial

(ii) no reason is given why rampant marijuana smoking will lead to experimenting with

harder drugs AND the types of reason that presently could be given would be

controversial.

Fallacious SSAs tend to be persuasive because:

(1) SSAs do not directly say that a seemingly harmless action A will immediately

(2) SSAs monger fear and worry. People see this disastrous result D and, in a state of fear

or worry, credit the argument.

lead to

disaster. Instead, they argue that a seemingly innocuous action A will lead to

consequence B , and B will lead (not directly to D ) but to a more plausible outcome C ,

and finally that C will lead to D.

E XAMPLE #4 OF F ALLACIOUS S LIPPERY-S LOPE ARGUMENT

P1 If you vote for Romney, he will ship jobs overseas. P2 If he ships jobs overseas, Americans will be miserable. C Don’t let Americans be miserable! Don’t vote for Romney.

The above SSA is fallacious because (i) no reason is given why a vote for Romney means he will

ship jobs overseas AND the types of reasons that could be given are controversial and (ii) no

reason is given why shipping jobs overseas will make Americans miserable AND the types of

reasons that could be given are controversial.

An SSA argument is legitimate when either of the following occurs:

HOW TO COMMIT THE S TRAWMAN F ALLACY

Step #1 Take a position P and distort it into a new position P- , which is just like P but is more extreme and less plausible. Step #2 Criticize P- for being too extreme and implausible. Step #3 Conclude that P is false, implausible, and should be rejected on the basis of the criticisms you raised in step #2.

The straw man fallacy is a fallacious form of reasoning because it purports to show that a

position P (or argument A) is deficient in some particular respect but what it actually shows is

that a weaker version of either P or A is deficient. Typically, straw man arguments are formed by

making one of the premises of the original argument more extreme. In contrast, SSAs do not

involve a distortion of an argument or position. Rather, they posit that some feature of the

position will lead to some extreme consequence.

Consider the following example of an argument that commits the straw man fallacy but

depends upon distorting the argument:

E XAMPLE #1 OF S TRAWMAN F ALLACY

1 John: Marijuana should be legalized for adults over the age of 21. 2 Liz: John proposes that marijuana should be legalized for everyone. 3 Liz: Studies show that who smoke large amounts of marijuana as adolescents are more likely to be depressed. 4 Liz: Therefore, John’s proposal to legalize marijuana is short-sided and leads to the extreme result of young children smoking marijuana.

In contrast, SSAs do not distort or misrepresent the original argument but propose a step-by-step

account of why some feature of a position will lead to an extreme result. However, it is possible

to commit both fallacies by (i) distorting an argument (turning it into a straw man) and then (ii)

committing the slippery slope fallacy by arguing (with no reasons) that a disastrous result would

follow if the conclusion of the argument were true.

3. Defying Gravity: The Inverse Slope or the Ski Lift Fallacy

SSAs work by articulating a sequence of events that culminate in disaster. The ski lift argument

is essentially the slippery slope argument in reverse except the end result is something

wonderful rather than something disastrous. Here is the basic structure:

S TRUCTURE OF A S KI L IFT S LOPE ARGUMENT

1 (premise) If A, then B. 2 (premise) If B, then C. 3 (premise) If C, then G ( Something Great !) 4 (conclusion) We definitely want G ( Something Great !), so do A.

Ski lift arguments are fallacious when reasons are not provided in the passage from A to G

because good reasons do not exist OR the reasons that do exist are controversial.

E XAMPLE #1 OF F ALLACIOUS S KI L IFT FALLACY

1 If you legalize marijuana, tons of people will smoke it every day. 2 If tons of people smoke marijuana every day, people will be really relaxed.

3 If people are really relaxed, crime will decrease significantly. 4 If crime decreases significantly, the government will have to spend less money on incarcerating felons. 5 If the government has to spend less money on incarcerating felons, they can spend more money on little, orphan children. 6 Help little, orphan children. Legalize marijuana.

The above argument commits the ski-lift fallacy as a reason is not provided for why the

legalization of marijuana will lead to rampant use AND available reasons would be

controversial.

Classroom Activity : In a small group, pretend you are an advertiser and create an argument that

commits the ski lift fallacy. Once you’ve completed your argument in your group, put it on the

board.

Exercise Set

A. Decide which cases are legitimate warnings of slippery slope dangers and which commit the fallacy.

  1. Don’t take Adderall during your final exam weeks! Soon you’ll be taking it for every exam, not just finals. After that, you’ll be taking it regularly just to get through class. And when you become numb to its effects you’ll move onto hard drugs like heroine!
  2. If you don’t come to class, you will not know the material being taught. Not knowing the material will get you a lower course grade and a lower course grade will lower your GPA.
  3. People should never use tanning beds. If you use them, you will be exposed to harmful rays. These harmful rays are carcinogenic, and you will get cancer and die.
  4. If we increase the strictness on our gun laws, it will surely lead to disaster. If no citizens are able to protect themselves, we will be defenseless to intruders and predators. If we are defenseless there will be exponentially higher amounts of crime in our societies.
  5. If you want to see a change in your body, you have to change your lifestyle! If you eliminate sweets from your diet and replace them with fruit, you will have more energy. With this new energy you will be able to increase your amount of exercise. With increased exercise you’ll surely see the pounds melt away!
  6. If you choose to go out and binge drink the night before an exam, you will be hung-over. If you are hung-over, you will not perform at your maximum ability on the exam. If you do not perform at your maximum ability, you will get a lower grade.
  7. If you major in theatre, you will have a hard time finding a job. If you don’t have a job, you will become homeless. If you become homeless, you will sit on street corners and beg for quarters. This will lead to a surely miserable life and you will die alone.
  8. If we build a swimming pool, we will want to swim in it. If we want to swim in it, so will our dog. If our dog wants to swim, it will jump in the pool and drown. Don’t kill the dog; don’t buy a pool.
  9. Marijuana should be legalized. If it is not legalized, the money from the illegal drug trade will continue to fund the black market. Studies have shown that the black market is largely funded by marijuana sales, and the black market also deals cocaine and illegal weapons. If we don’t legalize marijuana, more money will go to illegal drug and weapons. Recent studies have also shown that increased drug and weapon markets lead to an increase of violence in schools. Keep your children safe from violence, legalize marijuana.
  10. If we legalize marriage for homosexuals, we must institutionalize all unions that make each member happy. If we must consider all unions that make people happy, we must consider legalizing polygamy, marriage to animals, and marriage to objects. This is obviously ridiculous, so we clearly cannot legalize marriage between homosexuals.
  11. In The Princess Bride , the following argument appears when a man is presented with two goblets, one of which is poisoned. “Iocane (poison) comes from Australia, as everyone knows, and Australia is entirely peopled with criminals, and criminals are used to having people not trust them, as you are not trusted by me, so I can clearly not