- Thu Jul 13, 2023 4:29 pm
#102379
I find this question fascinating. Whether (A) or (E) is correct depends on what one thinks the quantifiers in English range over, which is an open question in contemporary philosophy. In fact, the LSAT's position on this issue is the one that presents more immediate difficulties than its rivals.
For example, if you think it is true (or even possibly true) that there are things that once existed, but do not exist now, then (E) is the better answer. (This is explained more below.) And isn't it plausible that there are things that once existed but do not exist now? According to the explanation here, that's not plausible, because it would amount to there being currently things that once existed but do not currently exist, which is contradictory. This is the presentist understanding (as philosophers would call it): briefly, that quantifiers range over all and only things that currently exist.
In marking (A) correct, that's clearly what the makers intended, but it seems implausible when you think just a little bit about it. It seems like in English the quantifiers not only range over things that once were but are no longer, but also things that are not currently but will be. For example, it's not absurd that an optimist about space colonization would assert that there are moon bases that will exist, but do not yet exist; there are moon bases that our descendants will build. This is, in a nutshell, the eternalist position. On this understanding, (E) is correct because, if there never was any such evidence, then the government could not have destroyed such evidence.
My conclusion is not that the makers of the LSAT should have considered this debate in temporal ontology. That's unfair. My conclusion is that they marked the answer choice correct that is correct only if one takes the more prima facie implausible interpretation of quantifiers in English.
It does no good to point out that "is" is in the present tense. The relationship between time and grammatical tense is hardly that tidy. "Cats are mammals" is not to be understood as "Cats are currently mammals", to use an easy counterexample. Also, there's no word in (E) that would render it incorrect even under the more plausible, eternalist understanding of quantifiers. "Effectively" and "disproves" are both fine; "if true" does a lot of work, mind you. And the occurrence of the modal "would" and the strengthened "even tend to support" also suggest that something more is going on, that the government is not just making a claim about what evidence currently exists, but perhaps about what evidence could possibly exist. This is really a separate point (alethic vs. temporal modality), but it's worth mentioning in this context.
OK, I argued with the LSAT. How embarrassing. I'll try to take a lesson from this. Narrowly, the LSAT makers are presentists, or at least write items as if they were. Broadly, don't overthink earlier questions.
(Apologies if this is not what the forum is for. I think this adds something to the discussion of this very interesting question.)