Logical ReasoningDifficulty: Hard

PT17 S2 Q15 Explanation

To perform an act that is morally

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

TopicsPrinciple-Conform

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Stimulus

To perform an act that is morally wrong is to offend against humanity, and all offenses against humanity are equally bad. Because murder is morally wrong, it is just as bad to have murdered one person by setting off a bomb as a hundred people by setting off that bomb.

What this question is testing

Principle-Conform

Your task

Break the argument into its conclusion and evidence, then do exactly what the question stem asks with that structure.

Common trap

Answers that sound relevant to the topic but don't connect to the argument's actual reasoning.

Winning move

Predict what a right answer must do, then test each choice against the conclusion-evidence 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
15.

Which one of the following judgments conforms to the principles

Answer choices

  1. Correct68% picked this

    If lying is morally wrong, telling a lie is as bad

    Why this is right

    We were told that "murder is morally wrong". And we were told that anything morally wrong is an offense against humanity. So we know that murder is an offense against humanity. If lying is morally wrong, then lying is also an offense against humanity. We were also told that "all offenses against humanity are equally bad". So if murder and lying are both offenses against humanity, then they are equally bad. Thus, we can get from this trigger to this outcome. If lying is morally wrong, then it's an offense against humanity that is equal in badness to all other offenses against humanity, such as murder.

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

  2. Illegal Negation18% picked this

    Risking one’s life to save the lives of a hundred people is morally no better than risking one’s

    This argument is trying to take what we were told about morally wrong actions, actions that are an offense against humanity, and apply the same logic to morally right actions, or actions that we might consider heroic. These principles told us that all bad actions are equally bad, but we can't turn that into "all good actions are equally good".

  3. Out of Scope: important to society5% picked this

    If stealing is morally wrong, it is equally important to society to prevent people from stealing as it is to

    This answer introduces the totally alien concept of how important to society it is to prevent something from occurring. We don't have any language like that in our principles, so we can't use those principles to adjudicate how important to society preventing certain actions would be.

  4. Out of Scope: accidental killing4% picked this

    Accidentally causing the death of a person is just as bad as

    We know that all morally wrong actions are equally bad. And we know that murdering someone is morally wrong. But is accidentally causing the death of a person "morally wrong"? We don't know. So we can't pass judgment on that.

  5. Unclear Morality5% picked this

    In a situation in which the life of one person can be saved only by killing another person, killing and

    We're able to say that any two morally wrong actions are equally bad. But do we know in a situation in which the life of X can be saved only by killing Y, that killing and not killing are both morally wrong? We don't. Maybe X is about to kill Y for immoral reasons and so for us to kill Y and prevent the death of X would be a morally okay action.

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