Modus tollens is an argument form that’s used in comprehension passages more often than you’d think. It looks like this:
- If p then q
- Not q
- > Therefore not p
It works on the basis of necessary and sufficient conditions. P is a sufficient condition for q (if p occurs, then q will occur), and q is a necessary condition for p (p cannot occur without q).
Take a look at the following excerpt from TPJC’s 2014 Prelim paper. Can you identify the propositions and conclusion?
Furthermore, if we consider the proposition that human rights have the capacity to protect us against the state, we must also take into account the fact that they are fundamentally created and enforced by states. In many parts of the world today, human rights simply do not exist because the state is weak or collapsed, rendered so by authoritarian rule or ineffective governance. In the case of the former, many think that once tyranny is demolished, human rights will emerge naturally from the rubble. Along these lines, it may be consoling to believe that the horrendous cruelty in Syria could be stopped by deposing the dictator and ending the war. But rights are constructs of civilization, not a natural human condition. In fact, if the President of Syria were toppled at this point, the most likely result would be a country stuck in a condition of chronic war. In other cases where the government has lost control or credibility, no rule of law prevails in daily life. In these circumstances, even the Prime Minister is not safe from kidnap by armed gangs, as the case has been in Libya.
One argument from the passage, deconstructed:
- If rights are a natural human condition, then human rights will emerge naturally once tyranny is demolished.
- Human rights do not emerge naturally once tyranny is demolished.
- > Rights are not a natural human condition.
Proposition 1 and the conclusion (3) can be found directly from the passage (parts underlined and in bold):
… many think that once tyranny is demolished, human rights will emerge naturally from the rubble. Along these lines, it may be consoling to believe that the horrendous cruelty in Syria could be stopped by deposing the dictator and ending the war. But rights are constructs of civilization, not a natural human condition. In fact, if the President of Syria were toppled at this point, the most likely result would be a country stuck in a condition of chronic war. In other cases where the government has lost control or credibility, no rule of law prevails in daily life. In these circumstances, even the Prime Minister is not safe from kidnap by armed gangs, as the case has been in Libya.
What about proposition 2? Instead of being explicitly written, it is to be deduced from the various examples. By raising the example of Libya and hypothetical example of Syria, the author is demonstrating how human rights do not emerge naturally once tyranny goes away.
Understanding the reasoning behind the modus tollens argument form helps structure your answer to this comprehension question (and other similar ones):
How does the author illustrate his claim that rights are ‘constructs of civilisation, not a natural human condition’ (line 30)? Use your own words as far as possible. [2]
Quite logically, we find that the author raises examples of failed dictatorships to show that human rights, law and order have to be instituted. They do not arise automatically from a vacuum of authority, as would be the case if they were an intrinsic part of our nature reasserting itself.