94 How to Win Every Argument
have that knowledge if the thing were true. One would rightly
reject a report that Camden Town Hall had been swallowed
whole by a slime monster if there were no reports of it in the
newspapers, no eyewitness accounts on television, no street
celebrations, or any of the evidence we would expect to
accompany such an event.
The ad ignorantiam forms the semblance of a cloak to cover
the otherwise naked beliefs of those who are predisposed to give
credence to extraordinary things. Under its comforting warmth
shelters a widespread popular belief in telepathy, poltergeists,
demonic possession, magic pyramids, Bermuda triangles and the
innocence of tobacco. (Television violence doesn't do any harm.
None of the surveys has ever managed to prove that it does.')
The argumentum ad ignorantiam is useful if your own views do
not follow received opinion. You can persuade others to share
these bizarre notions by appealing to the lack of evidence to the
contrary. Only slight difficulty is occasioned by the abundance of
evidence in many cases to prove you wrong: you reject the
evidence, deploying further ad ignorantiams to show that no one
has ever proved the evidence to be reliable. In this way you will
be able to sustain a preconceived view of things in the teeth of all
sense and experience. When you are expert at it, you can add the
letters 'ad ign.' after those denoting your degree in sociology.
After all, no one can prove that you shouldn't.
Ignoratio elenchiIgnoratio elenchi is one of the oldest fallacies known to us, being
first identified by Aristotle. When someone believes himself to be
proving one thing, but succeeds in proving something else
instead, he commits ignoratio elenchi. He not only argues beside
the point, but directly to a different conclusion.