Category Archives: Athesism Christianity

The Conjunction Fallacy and the Burden of Proof

11 Thursday Jan 2018

Posted by in atheism, Athesism Christianity, christianity, logic, philosophy, rationality, religion, Uncategorized

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As you know I think the philosophical burden of proof is a notion harmful to clear thinking.  My first post about it was here.  And here is a blog from someone who thinks very much the same way.  Here I will try to score some further points by undercutting common arguments used to support the view that having a burden of proof is helpful.

 

But first some background, what is the conjunction fallacy? Consider this example from Amos Tversky and Daniel Kahneman copied from Wikipedia:
“Linda is 31 years old, single, outspoken, and very bright. She majored in philosophy. As a student, she was deeply concerned with issues of discrimination and social justice, and also participated in anti-nuclear demonstrations.

Which is more probable?

1) Linda is a bank teller.
2) Linda is a bank teller and is active in the feminist movement.”

If you thought 2 was more probable, then you committed this fallacy.  It is a formal fallacy.  And it basically says that the probability of A+B will always lower or equal than the probability of A. As we add conditions the probability can only go down never up.

Why is this tricky to some people? (apparently most people chose option 2) Given the description of Linda many people might think she sounds like a feminist. Moreover, she does not sound like a bank teller. So the first option seems to only have what people think is unlikely.  Even though second option has what seems unlikely it also has what seem likely too. So the second option may seem preferable. But mathematically the second option will never be more likely than the first, because every time the second option holds true the first does as well.

When we add details to a claim the probability tends to drop. The probability that I am in front of my computer now, is greater than the probability that I am now in front of my computer wearing a shirt, which is greater then the probability that I am now in front of my computer wearing a brown shirt. This is just how logic works.  I think many of us know this and build this into our understanding of the world. So what does this have to do with the burden of proof?

If you go to youtube and type in burden of proof the first video to come up will be this one:

Listen to the first 20 seconds.
What is happening?  Well if you notice the person is not just asking whether “something” exists “in space” that we don’t have evidence of and whether we should believe that. Which I tend to think is true. But how would that help his case for “the burden of proof”? Of course it wouldn’t.

So he doesn’t just ask whether a general thing exists.   Instead he gets absurdly detailed with his description.  It is not something we don’t know about somewhere in space but under the surface of Pluto! And it is not just “something” its not even just some form of life, but a walrus. And of course even that is not enough. It is a “tiny” “were” walrus. But not only that it is a “psychic” tiny “wer”walrus. But no only that it is a tiny psychic werewalrus that “sends them psychic messages.” But not only that the messages come “every midnight.” And not only that but it does this while juggling skulls…..

 

Ok. So by now if you understand that fallacy of conjunction then you will know that amount of detail alone will drastically drive down the probability. There is no need to appeal any “burden of proof” to not believe in this creature. The probability is naturally driven down just by understanding the fallacy of conjunction.

It’s amazing that this video received 13,000 likes when it is really just an obvious play on this formal fallacy. Now if you are like me you will see this quite often from atheists. The other day when I said there is no philosophical burden of proof I was asked whether I believe “that there is an imperceptible penguin named “Percival” standing right across the room from me, wearing his imperceptible tuxedo and his imperceptible monocle and his imperceptible derby hat, holding his imperceptible pocket-watch.”

Now I want to point out that the proponents of a burden of proof who use these examples are not themselves committing the conjunction fallacy. But rather they just seem oblivious to its logic. It is the logic that makes the conjunction fallacy a formal fallacy that makes the probability of their examples quite low. So when you see these examples the response is not that they are committing a fallacy. Rather the response is more like yes the conjunction fallacy is indeed a fallacy so the probability of your extremely detailed scenario is low.

If you express doubts about “the philosophical burden of proof” you can expect this sort of thing. They won’t ask whether you can believe there is something somewhere we do not have evidence for. No, they will not even ask whether there is some species of life we have no evidence of yet. Rather they will ask about a particular horse that we have no evidence of. But not just a horse, but a horned horse, but not just a horned horse, but a horned horse with exactly one straight long horn coming out of its head. And often even that won’t be enough the horned horse will have to be pink.

And you might respond explaining this fallacy and ask them whether they believe there is something somewhere he/she does not yet have evidence of. I certainly believe there are things that exist that I have no evidence of. For example there very well may be a particular cricket in the southwest United States that I have no evidence of.

Which brings me to another point here. There is more than just the conjunction fallacy at work here. There are also background beliefs. There are probably crickets in the southwest United States. But when and how did a walrus get to Pluto? (forget the whole juggling psychic were bit)

Perhaps the classic example of this sort of argument is Russel’s Teapot. Russel said:
“ … nobody can prove that there is not between the Earth and Mars a china teapot revolving in an elliptical orbit, but nobody thinks this sufficiently likely to be taken into account in practice. I think the Christian God just as unlikely.”

So again, its not just something in space we don’t have evidence of.  It is something between the Earth and Mars and revolving in an elliptical orbit. It is not just something but a piece of China. And it is not just China but a China teapot. So we can see the logic of  conjunction fallacy at work reducing the probability.

But we also have background beliefs and evidence at work as well. Plantinga wrote:
“Clearly we have a great deal of evidence against teapotism. For example, as far as we know, the only way a teapot could have gotten into orbit around the sun would be if some country with sufficiently developed space-shot capabilities had shot this pot into orbit. No country with such capabilities is sufficiently frivolous to waste its resources by trying to send a teapot into orbit. Furthermore, if some country had done so, it would have been all over the news; we would certainly have heard about it. But we haven’t. And so on. There is plenty of evidence against teapotism.”

Another example might be if I say if we randomly pick a house in a New York suburb will there be three black horses in the Garage? You might say no. One reason would be conjunction fallacy. But also you would have back ground beliefs about what suburban houses likely have in their garage. If I asked does that house have light fixtures in it, well then you might say yes.

So Plantinga brings up evidence. And I think that may be a good way to describe what he is doing. But sometimes there are things that just don’t accord with our background beliefs. Now maybe these background beliefs are rational maybe they are not. Sometimes it may be difficult to completely understand or articulate why a certain claim seems true or untrue. Is there something beyond the known universe? In any case we have far more beliefs than we may even consciously realize.

For example, I never realized I believe plaid cats do not exist until last month. But I suppose I always believed it. (that is I was inclined to act in a way that accorded with the statement “there are no plaid cats”) This may be a sad fact of this kluge we call our brains. But it does not justify erecting some imagined burden of proof.  That is just piling error on top of error. When we consider 1) our background beliefs, 2) evidence and 3) the logic of the conjunction fallacy there is no reason to appeal to the burden of proof.

If you are so inclined I would love it if people would post a link to this blog in the comments of the above youtube video. Perhaps we can get a discussion going and deepen everyone’s understanding of this issue.

Bearing False Witness – Book Review

17 Monday Oct 2016

Posted by in atheism, Athesism Christianity, Catholic, history, Morality, philosophy, rationality, science, Uncategorized

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I just finished listening to three books by Rodney Stark, Bearing False Witness, Triumph of Faith, and How the West Won.  Here is just a brief review of the first book.

 

In Bearing False Witness, he describes how he believes the Catholic Church has received unwarranted attacks over the centuries.   As a History buff of medieval Europe and the middle east I have come to draw similar conclusions on a variety of topics.  But this book has that as the central thesis, therefore he marshals the facts for more coherent case.

 

Stark puts it all together with his central thesis in mind and does so in an informative way.  He covers different issues with a broad brush.  These include the Church’s interaction concerning Nazism, the Crusades, the bible’s formation, treatment of other religions including Judaism, the inquisition, slavery, science, and tyrannical governments. Since he covers the issues in a relatively broad brush the book is an easy read/listen.

 

The topics included some information that I already learned from other sources as well as new information.  I found that when he covered a topic I already had background information on, he was fair in his treatment.   That’s not to say he took pains to present every possible counter example, but on the whole he was fair.

 

He opens with a question the question why bother trying to defend the church and dredge through all this history?     It’s a question I asked myself in a prior blog.  But whereas I could not formulate a decent answer, he did by quoting Garrett Mattingly “Nor does it matter at all to the dead whether they receive justice at the hands of succeeding generations. But to the living, to do justice, however belatedly, should matter.”

 

I really enjoyed the chapter concerning science.   The basic construct of scientific method had already been put together by various monks and religious people in the middle ages.   Later scientists who are often credited as being the fathers of science were putting those principles into use on a very large and impressive scale.   I was quite impressed with the quotations from the scholastics which formed the bedrock of scientific method.

One interesting theory he suggested, was that science did not so much need to fight religion as much as it did the Platonic view that empirical information was not as valid as a-priori ideas.

In the end if you think you will learn the Church always acted just like we do now with our modern sensibilities, you will be disappointed.  However, if you would be satisfied with a strong case that the Church has been a huge force of progress, in science, education and morality then I think this book is for you.

 

Evidence of Objective Moral Realism

10 Tuesday May 2016

Posted by in atheism, Athesism Christianity, Catholic, christianity, logic, metaethics, Morality, philosophy, rationality, Uncategorized

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A fellow blogger and sometime commentator here, Howie, asks some questions for theists.

https://truthiselusive.wordpress.com/2016/04/22/meaningful-sadness/

He wonders what effect would it have on our morals if we suddenly found out God did not exist.  It’s a great question and I found I could spend allot of time answering this.

 

In my response I indicate that “I would highly doubt any objective morality exists in reality, and if it did exist I would not believe we had any reliable way of knowing what it was.”

 

I have blogged extensively about the second part of that statement:

https://trueandreasonable.co/2014/02/24/a-problem-with-the-reliability-of-moral-beliefs/

Here I want to address the first part.  I want to explain why “I would I highly doubt any objective morality exists in reality” if I found out God did not exist.

 

But first, I want to reiterate that I do not think there is any logical inconsistency with atheism and belief in objective morality.   That said I am unaware of any actual evidence that an atheist would have for believing in objective morality.    That is, if we were to know there is no God then all the evidence we have for objective morality goes out the window.   It’s one thing to say objective morality is logically possible, it’s another to say we have some evidence that it is true.

 

To understand my position let’s start with a reverse question for atheists.   Let’s say you suddenly find out that the Christian God exists.  What would that mean for your views on morality?

 

I would think most people would agree that if the Christian God exists, then it’s very likely that objective moral realism is true.    God orchestrated our existence and reality so that we might be ultimately judged and this judgment will be just.  Reality would have been built with this moral feature.

 

From that, it follows that evidence that the Christian creator God exists is also evidence that objective morality is a feature of reality.   The evidence that the Christian God exists would be things like the miracles recorded in scripture.  Again people can debate whether this is strong evidence or weak evidence, and what if any burden of proof there is, but it is “some evidence.”  This also happens to be the only evidence that our objective reality contains moral characteristics. (I don’t mean to exclude other religions that teach of a Creator God who had a hand in creating a moral reality.  So yes evidence for Islam, or Judaism would also be evidence for objective moral realism but here for simplicity sake I am just taking Christianity versus atheism.)   So the logic is exhibit A suggest exhibit B.  Exhibit B Suggests exhibit C.  A = miracles B=Christian God exists and C = Objective moral realism is true.

 

Do we have other evidence that objective morals are actually a feature of reality?  I really don’t think so.  Again because “wrongness” cannot be detected by our 5 senses it seems impossible to have evidence of it outside of testimonial evidence from someone who is not bound by our 5 senses.

 

The fact that we feel strong guttural emotional responses when we see certain “good” or “bad” actions is not, to my mind, evidence that there is actually a real objective truth to moral claims.  However, if something with a supernatural understanding designed us then of course we might think our emotions are properly cued to these real moral truths.

 

So the Christian God existing would be strong evidence that real objective morals would exist.  If we were to eliminate that evidence of objective moral reality existing (Say because we “find out” no God exists) then we are hard pressed to find *any* evidence of objective moral reality.   That’s not to say its logically impossible for objective moral reality to exist without God.  Nonetheless, it would be a huge blow to objective moral realism’s case to lose – exhibit B – the existence of God.