Logical Gal and the Argument from Ignorance

20 Feb

I heard someone accuse another of employing the Argument from Ignorance.

He painted the scenario like this:

Accuser:  “You are being UNreasonable.   Why?  Just listen to what you are, in essence, saying: Since we don’t have an explanation for how the universe came into existence, then it must be God who caused it.  That is defaulting to arguing from a basis of ignorance and that, my friend,  is a fallacy!”

As it turns out, the one putting forth the ‘God Hypothesis’ actually had some good reasons for his conclusion.  He was using abductive reasoning.  This form of logic takes the information at hand and seeks the best possible explanation based on evidence at hand.

What’s interesting about the Argument from Ignorance is that there are two versions, the converse of the other.

  • Since you can’t prove mermaids don’t exist, therefore they exist!
  • Since you can’t prove mermaids do exist, therefore they don’t!

The latter also involves a false dilemma.  It assumes that there are only 2 choices:

a) we either KNOW that a proposition is true

b) or we KNOW that a proposition is false

But there is actually a 3rd choice – that we don’t know…

Question:  are there other possibilities than  TRUE, FALSE or DON’T KNOW?

Where do you encounter this kind of faulty thinking?

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