Hi there, follow skeptics,
I am going to continue my on-going run of logical fallacies. Today I am going to be talking about a very common logical fallacy, not only used in discussions involving skepticism, but in everyday life. It is the argument called ‘moving the goalposts’. It is essentially a dirty, intellectually dishonest tactic to ensure that your opposition never reaches the full set of criteria for approval. It is not technically a logical fallacy, because there is no fault in logic in this argument, but it is usually counted as a fallacy because it is a common tactic, and it is not a very honest one at that.
The basis of this debating tactic is that you can always ask for more and more proof of something, all the time knowing that you will always be able to ask for more proof without ever having to concede defeat. I will explain it using the evolution/creation argument because it is a very common use of this arguing tactic.
A creationist states to an evolution proponent that there is a big gap between whales and land mammals, which must be filled in order to prove evolution.
The evolution proponent then proceeds to go out and do all the work, and manages to find a transitional fossil between mammals and a whale.
The creationist then has two options, he can either ask for a transitional fossil between two different species, or he can ask for fossils between the whale and the whale-mammal hybrid, or between the whale-mammal hybrid and the mammal. (notice this is also a god of the gaps argument in this case, I will deal with that logical fallacy later)
This is a moving the goalposts fallacy. This process can continue on for ever, with the creationist just asking for more and more proof, and the evolutionist providing it, and then the creationist asking for more.
No matter how hard the evolutionist works and how much proof he finds, it will always be just below the creationists criteria.
Another common example of this argument tactic is used by proponents of god in general. However, despite being a moving the goalposts strategy, it works in reverse to the previous example. God is usually described as the gap in our knowledge about the universe. This has been the general theory of god since its beginning.
When it was not understood how lighting and thunder was made, god was accepted as the creator of this thunder. An atheist at the time would have said that lightning is natural, the normal response would be “prove it.” So the atheist goes out and proves that lightning does not need god to explain it away. The god-believer will then say, “god makes the planets go around.” The atheist goes out and proves that there is no need for god to explain the planets motions.
This process continues to the stage where god is just the so-called ‘writer-of-the-rulebook’, and he decided upon the physical laws, and now just sits back and watches the action unfold. According to god proponents, god still exists, so they are happy, despite the fact that god is being pushed into an ever smaller corner. This is also an example of moving the goalposts.
That’s all for today, I will leave you with a quote from Bertrand Russell, “Logical errors are, I think, of greater practical importance than many people believe; they enable their perpetrators to hold the comfortable opinion on every subject in turn.” Bertrand Russell, a British philosopher, logican, mathematician, historian and social critic of some note.