Logical ReasoningDifficulty: Hard

PT18 S2 Q8 Explanation

During the 1980s the homicide rate in Britain

A free, expert breakdown of this official LSAT Logical Reasoning question.

TopicsFlaw

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Stimulus

During the 1980s the homicide rate in Britain rose by 50 percent. The weapon used usually was a knife. Potentially lethal knives are sold openly and legally in many shops. Most homicide deaths occur as a result of unpremeditated assaults within the family. Even if these are increasing, they would probably not the permissiveness of the government that allows such lethal weapons to be sold.

What this question is testing

Flaw

Your task

Describe the reasoning error the argument actually commits.

Common trap

Answers that name a real logical flaw the argument doesn't actually make.

Winning move

Articulate the gap in the reasoning yourself, then match it to the choice that describes that gap.

Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.

The question
8.

Which one of the following is the strongest criticism of the

Answer choices

  1. Too Weak18% picked this

    There are other means besides knives, such as guns or poison, that can be used to accomplish homicide by a person who intends

    This isn't a super strong objection: hey, author, if it hadn't been for knives, these (unpremeditated) crimes of passion that happened within a family would have happened anyway with guns or poison or other lethal methods. The phrase 'a person who intends to cause the death of another' makes the objection a little out of scope. Unpremeditated family violence is not one person intending to cause the death of another. It's someone reaching a breaking point and lashing out violently and often accidentally or regretfully causing the death of another. Not to mention, common sense tells us that the average household is more likely to have a knife than to have a gun or poison.

  2. Irrelevant1% picked this

    It is impossible to know how many unpremeditated assaults occur within the family, since many are not

    We don't need to know the exact number of unpremeditated assaults. We know the reported number went up by 50% and this answer doesn't help us make any sort of objection that sounds like "don't blame knives ... had they been illegal, that wouldn't have changed much".

  3. Strengthens, if Anything2% picked this

    Knives are used in other homicides besides those that result from unpremeditated assaults

    Telling us that knives are used in other murders, too, is only helping the author's case that the government should have done something about knives.

  4. Not Assumed23% picked this

    The argument assumes without justification that the knives used to commit homicide are generally purchased as part of a deliberate plan to commit murder

    The author seems to be thinking the opposite of this. She's thinking that people buy legal knives and have them in their house (probably for cooking) and then use them when they're suddenly wanting to hurt someone in their family. Since she's targeting unpremeditated homicides, the idea that these knives were part of a deliberate plan goes squarely against the story we heard.

  5. Correct56% picked this

    If the potentially lethal knives referred to are ordinary household knives, such knives were common before the rise in the homicide rate; but if

    Why this is right

    This hurts the plausibility of the author's causal story. If they're ordinary cooking/eating knives, then they existed prior to the homicide rate. (Cause, No Effect plausibility weakener) How could these knives be the causal difference-maker that explains the uptick in homicides in the 1980s if these knives weren't different? (i.e. people already had them in the 1970s) If they're knives designed as weapons, then you wouldn't find them in most houses (No Cause, Effect plausibility weakener). How could these weaponized knives be the causal difference-maker that explains all these unpremeditated family homicides if these knives weren't found within households? An unpremeditated assault means that it just happens, with whatever's nearby. If you leave the house to procure a weapon, it's not unpremeditated anymore.

    Skill tested: Flaw · how this choice captures the argument's function is the move to repeat next time.

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