Kendrick: Governments that try to prevent cigarettes from being advertised are justified in doing so, since such advertisements encourage people to engage in an unhealthy practice. But cigarette advertisements should remain legal since advertisements for fatty foods are legal, even though those advertisements also encourage people to engage in unhealthy practices.

"Surprising" Phenomenon

How can governments that try to prevent cigarettes from being advertised be justified in these attempts, even though cigarette advertisements should remain legal?

Objective

The correct answer should show how governments might be justified in trying to stop cigarette advertisements even if these advertisements should still be legal. Perhaps there’s a method to prevent cigarette advertisements that doesn’t involve trying to ban them or make them illegal.

A
Any advertisement that encourages people to engage in an unhealthy practice should be made illegal, even though the legality of some such advertisements is currently uncontroversial.

One part of the discrepancy is the fact that the advertisements should be legal. (A) contradicts this fact by saying these advertisements shouldn’t be legal. Denying one of the facts doesn’t help resolve the discrepancy.

B
The advertisement of fattening foods, unlike that of cigarettes, should not be prevented, because fattening foods, unlike cigarettes, are not addictive.

What the government should do with fattening foods doesn’t impact what the government should do with cigarettes.

C
Most advertisements should be legal, although advertisers are always morally responsible for ensuring that their advertisements do not encourage people to engage in unhealthy practices.

But how can the government still be justified in attempting to prevent cigarette advertisements from being shown? This answer doesn’t provide a potential answer.

D
Governments should try to prevent the advertisement of cigarettes by means of financial disincentives rather than by legal prohibition.

Even though cigarette advertisements should be legal, the government can be justified in preventing cigarette advertisements through financial disincentives. For example, maybe taxing the ads could get cigarette companies to refrain from showing ads.

E
Governments should place restrictions on cigarette advertisements so as to keep them from encouraging people to engage in unhealthy practices, but should not try to prevent such advertisements.

Part of the discrepancy is that the government is justified in trying to prevent cigarette advertisements. (E) contradicts this part of the discrepancy by saying the government should not try to prevent the ads. Contradicting one part of the discrepancy doesn’t help explain it.


56 comments

Failure to rotate crops depletes the soil’s nutrients gradually unless other preventive measures are taken. If the soil’s nutrients are completely depleted, additional crops cannot be grown unless fertilizer is applied to the soil. All other things being equal, if vegetables are grown in soil that has had fertilizer applied rather than being grown in non-fertilized soil, they are more vulnerable to pests and, as a consequence, must be treated with larger amounts of pesticides. The more pesticides used on vegetables, the greater the health risks to humans from eating those vegetables.

Summary
Failure to rotate crops depletes the soil’s nutrients gradually unless other preventative measures are taken. If the soil’s nutrients are completely depleted, then additional crops can be grown only if fertilizer is applied to the soil. If vegetables are grown in soil that has had fertilizer rather than being grown in non-fertilized soil, they are more vulnerable to pests. Consequently, these vegetables must be treated with larger amounts of pesticides. The more pesticides used on vegetables, the greater the health risks to humans from eating those vegetables.

Notable Valid Inferences
The vegetables were grown in soil not completely depleted of nutrients.

A
The soil in which the vegetables were grown may have been completely depleted of nutrients because of an earlier failure to rotate crops.
Must be false. As shown in our diagram, soil that is completely depleted and growing crops requires the use of fertilizer.
B
It is not possible that the vegetables were grown in soil in which crops had been rotated.
Could be false. We have no information in the question stem that would trigger the first set of conditionals in our diagram. We are only given the condition that fertilizer has never been used, which triggers our second set of conditionals.
C
The vegetables were grown in soil that had not been completely depleted of nutrients but not necessarily soil in which crops had been rotated.
Must be true. As shown below, if fertilizer has never been used it is impossible that the soil is completely depleted of nutrients.
D
Whatever the health risks to humans from eating the vegetables, these risks would not be attributable to the use of pesticides on them.
Could be false. We only know that the vegetables were grown in soil that has never had fertilizer applied. We do not know whether pesticides were also used.
E
The health risks to humans from eating the vegetables were no less than the health risks to humans from eating the same kinds of vegetables treated with pesticides.
Could be false. We only know that the more pesticides used on crops, the greater the health risks to humans. We do not know whether pesticides were used on the vegetables, we only know that they were grown in soil that has never had fertilizer.

71 comments

Wirth: All efforts to identify a gene responsible for predisposing people to manic-depression have failed. In fact, nearly all researchers now agree that there is no “manic-depression gene.” Therefore, if these researchers are right, any claim that some people are genetically predisposed to manic-depression is simply false.

Chang: I do not dispute your evidence, but I take issue with your conclusion. Many of the researchers you refer to have found evidence that a set of several genes is involved and that complex interactions among these genes produce a predisposition to manic-depression.

Summarize Argument
Wirth concludes that no one is genetically predisposed to manic-depression. He supports this by saying that all attempts to identify a “manic-depression gene” have failed, and most researchers now agree that no such gene exists.

Identify and Describe Flaw
Chang points out that Wirth’s argument is flawed because his evidence doesn’t support his conclusion. Just because there’s no “manic-depression gene” doesn’t mean that people can’t be genetically predisposed to manic-depression. Wirth assumes there’s only one possible cause of genetic predisposition, but other factors, like multiple genes interacting, could also be involved.

A
It presupposes only one possibility where more than one exists.
Wirth presupposes that there’s only one possible cause of genetic predisposition— a “manic-depression gene.” But Chang points out that other factors, like multiple genes interacting, could cause someone to be genetically predisposed to manic-depression instead.
B
It depends on separate pieces of evidence that contradict each other.
Wirth’s pieces of evidence— efforts that have failed to find a “manic-depression gene” and researchers who agree that no such gene exists— do not contradict each other. Also, Chang doesn’t criticize Wirth on this front; instead, he explicitly accepts Wirth’s evidence.
C
It relies on the opinion of experts in an area outside the experts’ field of expertise.
Presumably the researchers that Wirth cites aren’t experts in some field other than genetics. But even if they were, Chang doesn’t criticize Wirth’s evidence at all; he accepts it.
D
It disallows in principle any evidence that would disconfirm its conclusion.
Chang presents evidence that disconfirms Wirth’s conclusion, but Wirth never claims to disallow such evidence on principle. And even if he did, that doesn’t describe Chang’s criticism of Wirth’s argument.
E
It treats something that is merely unlikely as though it were impossible.
Wirth does treat the existence of a “manic-depression gene” as impossible, but so does Chang and so do the researchers. In other words, it’s not “merely unlikely” that a “manic-depression gene” exists, it actually is impossible. Also, Chang doesn’t criticize him on this front.

67 comments