They also teach you this in law school; the intention or outcome of a certain rule or law may be informative about why the law was passed or how it should be interpreted. The “legislative history” or notes may also be informative.
But it has become especially unpopular to interject information that comes from outside of the “letter of the law”. You can try to follow the “spirit of the law” (Japan may not position itself to the US’s great disadvantage at peace) but that concept is subject to exceptions (SZ 6 –-> is within range of Alaska so America can still be attacked).
Its much better to try and read the rules as literally (but flexibly) as possible. Krieghund sometimes gets irritated that people question the clarity of the rules (though the designers have admitted mistakes/ambiguity when they have been made) because people seem to take for granted that the designers worded the rules at great length and that the rules are usually clear when they are not being twisted.
One very current example of this is Advise and Consent. If the words “Advise and Consent” have any meaning at all, it means that Congress must approve all Federal Judicial Candidates (and Cabinet irrc). However, there is little if any “advice” being given by a hostile congress controlled by the opposite party. And, in this case, absolutely no Consent, discussion or debate. The literal words do not require the Senate to debate the nomination, they can simply ignore it.
Then you would ask, why would the framers have created a non-functional system that prevents the court vacancies from being filled (except with candidates the senate would desire)? The answer is, it was a compromise between allowing Washington/POTUS to appoint his own cronies and functionaries at will, and the Senate essentially doing so. However, as we can see now, this compromise creates an impasse for which there is essentially no solution.
However, no matter how much we oppose the current state of affairs as being a nearly intentional uncorrected gridlock in our system (same gerrymandering, budget approval, and filibusters) and as being impractical, it is the only logical way to interpret the rules. If “Advise and Consent” does not mean that the Senate can ignore these appointments, the do we reshape the meaning of that phrase to mean that Congress’s vote is not needed, or that they must vote simply because we don’t like the outcome (which is that ALL the appointments will go unfilled until there is a democratic congress)?
Thanks for FAQing the question.