The theory and practice of argumentation and debate

by Victor Alvin Ketcham

It very often happens that a well known authority frequently used by the opponents of a proposition has changed his opinions or expressed himself more definitely in such a way as to favor the speaker’s contentions. Advantage should always be taken of such a state of affairs. It is a most strategic move to be able to quote an opponent’s authority against him. One should be sure, however, that the authority quoted is such as will be accepted. Otherwise it is better to attack the validity of this authority.

The above suggestions and illustrations are offered purely by way of inducing the student to keep a sharp lookout for points in his favor. There are many ways in which the attendant circumstances may be used to give greater weight to the evidence offered.

4. The selection of evidence must be fair and reasonable.

An advocate of any cause, public or private, must have as a basis for his argument a genuine regard for right and justice. Therefore he is bound to exercise due care in making sure that the selection of evidence is fair and reasonable. No one who argues can gain any permanent advantage from the use of unfair methods. In using quotations from authority be sure that the words used indicate exactly the position of that authority. By skillful omissions a reputable authority may be made to defend almost any position. In the use of statistics the temptation to juggle is sometimes strong. Statistics, by skillful combinations and omissions, can be made to prove an absolute lie. In discussing the income from a kind of state tax which is utilized in all the most important states in the Union, the student who selected the states of Nevada, South Dakota, and Rhode Island to show that the income derived from the tax was a substantial source of revenue, must have succeeded only in proving to his audience that he had had great difficulty in finding states in which the tax had proved to be a success. Had he been able to produce statistics to show that Massachusetts, New York, Pennsylvania, Ohio, Illinois and other large and populous states were using his form of taxation with success, his chance of persuading his hearers would have been incalculably increased.

Not only must evidence be fairly selected but it must be reasonable as well. No statement which is contrary to the usual experience of the individuals addressed should be made unless it is based upon indisputable authority. Facts outside the pale of usual human experience are always regarded with distrust. Abnormal conditions, such as the existence of unusual misery or vice among certain classes, oppression, glaring social, industrial, or political evils, must always be kept within the bounds of possibility and based upon reliable authority. The temptation is often strong to cite instances on account of their sensational character and the probable striking effect upon the audience or readers. Such material is sometimes very important, but if it even approaches the border of impossibility it should be fortified by the strongest evidence.

The value of certain evidence may be greatly increased if it can be shown to be reasonable. If surrounding circumstances can be introduced to show that the evidence is either cause or effect and therefore something naturally to be expected under the conditions stated, it will be accepted almost without question. All evidence should be carefully considered from the two standpoints of fairness and reasonableness. To offer unfair evidence is dishonorable. It is the method of the swindler and the trickster. It is especially reprehensible in the student of argumentation, whose first duty is to uphold the truth.

5. The position and arguments of the opposition should be taken into consideration.

Argument implies opposition. It may not be active opposition, it may be only passive. Arguments advanced for the purpose of inducing a change meet conservatism, prejudice, and the natural feeling of distrust with which any change is contemplated. These obstacles to success must be met squarely. It is by this means alone that they can be overcome. In the analysis of the question the necessity of finding the main contentions on both sides was made plain. We have now reached a point at which these contentions become of great importance. The arguments of the opposition must never be disregarded. Many important advantages besides the economy of time and material, come from the selection of such evidence as will uphold the constructive argument and at the same time overthrow the opposition. The selection and rejection of evidence must be determined from this standpoint.

6. That evidence should be selected which will appeal most strongly to those to whom the argument is to be addressed.

In presenting an argument the writer or speaker must not always rely upon his own judgment as the criterion of the value of evidence. He must take the standpoint of those who are to hear or read. This attitude presupposes that the evidence offered is reliable. If a speaker or writer knows that evidence presented is unreliable but will nevertheless be accepted by his auditors or readers, he is perpetrating a fraud if he offers it. That reliable evidence which is most likely to appeal to those before whom it is to be placed should be selected. The arguer should put himself in the position of the persons to be persuaded, and ask himself the question, “What evidence would most strongly appeal to me and induce me to believe and act in the manner desired if I were the person to be persuaded?” The accuracy with which the advocate can perform this feat often measures his success. It requires the highest order of constructive imagination. He must view his position with all the prejudices and preconceived ideas, as well as the personal interests, of the persons to be persuaded. He must, for the time being, lose his character as an advocate and assume that of the reader or hearer.