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Does lack of evidence work as evidence of lack, in this sense? [Spirituality & Religion]

So, here's my example (yes, I know, the unicorn example has been done to death but I find it's a great analogy):

So let's say I walk up to you and say, "Unicorns exist. Prove me wrong." Of course your initial response would be that you don't have to, which I'd say would be justified, but could this response also work?

"Well, think for a second. If unicorns were real, we would see its impact on the planet. We would find fossilized unicorn horns, unicorn footprints, etc. But we've scoured the planet looking for these types of evidence or impact, and found nothing. We have lived on this planet for around 200,000 years, in since our existence we have found no trace of verifiable evidence to prove the existence of such creatures. Therefore, unicorns don't exist."

Basically I'm thinking that perhaps absence can work as evidence of absence if there is no evidence where it counts, for example, someone says it rained two hours ago, and you check the roads. There's not a hint of moisture on them, and the sun is shining brightly. Therefore, it probably didn't rain.

Of course, there is still a possibility, but this hypothetically allows for a good probability of non-existence.

I'm posting this in the "Religion and Spirituality" section because I think this could work for the God question as well. Thanks in advance.
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Yes, you're correct. The "absence of evidence is not evidence of absence" thing is generally true in the abstract, but absence of evidence is evidence of absence if there is an absence where such evidence ought to be found. If you have some verifiable theory, say evolution, which predicts that if X exists, you should find Y and Z also, and Y and Z are not forthcoming, then you are at least justified in supposing X is false.

Of course, as with all empirical claims where you are generalizing from a sample and do not have every case in front of you, you can't make absolutely certain pronouncements, but the quest for absolute certainty is something of misleading ideal anyway. It may, for instance, turn out that unicorns do exist, but they just vanish into nothingness upon death, so the predictions made by evolution about fossils and such just don't apply to this special case.

Still, you're basically correct.
Animore · 26-30, M
Thanks, and yes, as I stated in my original post, I don't think you can prove something with absolute certainty with these types of arguments.